Manually update Xamarin Studio - xamarin

I would like to switch to Alpha channel in Xamarin Studio on Windows, the Update utility managed to download GTK# and Xamarin Studio 6.1.0 but failed to download Xamarin 4.2.0 and couldn't resume the download.
My question is where the temporary files are stored? and can I get a direct link to the latest alpha Xamarin 4.2 to download it and put in in the temp folder.
A third question is can I install 4.2 with XS while continuing with 4.0 on VS?
Edit: I get the path:C:\Users\X\AppData\Local\XamarinStudio-5.0\Cache\TempDownloadbut I want to know to resume a failed download or get the direct link because I can only find those of stable releases.

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How to use an older version of Xamarin.iOS with Visual Studio Mac?

Hi i mistakenly upgraded Visual Studio for Mac to 8.5.2 (build 13) which has Xamarin.iOS Version: 13.16.0.13 (Visual Studio Community).
Turns out this doesn't work with XCode 11.3.1 and needs XCode 11.4, which means I will need to upgrade the OS from Mojave to Catalina; i'm not ready to upgrade the OS just yet..
I have tried searching on the Microsoft website, but cant see any obvious links to downgrade or select a different Xamarin.iOS version
How can i roll back the Xamarin.iOS to a version that is compatible with XCode 11.3?
To use an older version of Xamarin.iOS you need to download it from a link.
It's very difficult to answer this question, because the answer need a link..
And Link-only answers can become invalid if the linked page changes...
So, First you need to find the version number of your wanted Xamarin.iOS.
Here you can see all release Version tags from the official
xamarin github repository.
https://github.com/xamarin/xamarin-macios/tags
Then you need to found the Microsoft official patern link from their official download .pkg repository used by Visual Studio.
The official Microsoft pkg repository : https://aka.ms/xvs/pkg
The patern link : https://aka.ms/xvs/pkg/<framework>/<version>.
Finally, you need to create your own link regardless you framework and version
Example:
Xamarin.iOS: https://aka.ms/xvs/pkg/macios/15.4.0.0
But you need to found out your own link by your self.
You can also try from the github
Xamarin.iOS https://github.com/xamarin/xamarin-macios/blob/main/DOWNLOADS.md

Need lower version of visual studio for mac

I just want to download a lower version of Visual Studio for Mac. The current version is 7.5.1 and I want to download 7.4.3.
Can anyone tell me where can I get that download file or link?
From some guesswork I found it by using this URL :
https://dl.xamarin.com/VsMac/VisualStudioForMac-7.4.2.12.dmg
Not installed it tho.
From this, comment on the 9th May link seems like you have to open a support ticket?!?!
As an update on this topic, all of the recent previous Xamarin.iOS,
Xamarin.Android, and Xamarin.Mac packages are available in the
archives on the open source continuous builds server (under the
Xamarin.Android and Xamarin.MaciOS tabs). And the Mono Framework MDK
is similarly available in the Mono Project download archive. I have
now updated the 15.7 Release Xamarin Release Blog post to provide the
links to those locations. In many cases, the latest version of Visual
Studio for Mac will be backwards compatible with previous versions of
the Xamarin SDKs, so you can in many cases just install those earlier
Xamarin SDK versions over the current versions and leave Visual Studio
for Mac and Mono Framework MDK at the latest.
If you do need to get an older version of Visual Studio for Mac
itself, the best option at this time is still to create a support
incident to request the version you'd like. The updated info for
creating a Visual Studio for Mac support incident is to go to
Technical Support > Product: Visual Studio > Assisted Support on
https://www.visualstudio.com/vs/support/ and then select Visual Studio
Community/Professional/Enterprise 2017 for Mac.
I used to download previous releases from my Xamarin account page
which now doesn't seem to exist anymore.
At the moment, the direct link to the old downloads page
(https://store.xamarin.com/account/my/subscription/downloads) is not
yet set to redirect, so it is still possible to access that page, but
indeed that page is considered deprecated in favor of the open source
continuous builds archive at this time, and the previous versions
provided on that page are from the earlier Xamarin 15.5 Release rather
than the Xamarin 15.6 Release.
Bunch of other versions in case someone needs them:
https://dl.xamarin.com/VsMac/VisualStudioForMac-7.3.0.797.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-7.3.0.799.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-7.3.3.5.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-7.3.2.12.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-7.4.0.1033.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.4.0.839.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-7.3.3.5.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.4.0.884.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.4.0.985.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.4.0.1026.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.5.0.933.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.5.0.1062.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-7.4.1.48.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.5.0.1161.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.5.0.1244.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.5.0.1222.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-Preview-7.6.0.711.dmg
https://dl.xamarin.com/VsMac/VisualStudioForMac-7.8.4.1.dmg
Note: These are from the index.xml files that VS4M downloads that includes all the matching packages for each release
You could also look for versions listed at the brew repository.
Use the url pattern https://dl.xamarin.com/VsMac/VisualStudioForMac-{version}.dmg.

Xamarin Android SDK Manager doesn't save locations

Using Visual Studio 2017 and Xamarin, I installed the Xamarin Android SDK Manager to replace the default Android SDK Manager, which is now deprecated.
Then I updated JDK to the current x64 version and, using the Xamarin SDK Manager, I installed the most recent version of Android NDK.
I now want to update the locations of these SDK's in the Xamarin Android SDK Manager, Locations tab like so:
Yet, every time I restart the tool, the locations are reset. It also keeps telling me there's 2 components to install, yet when I do, it doesn't complain about any failure.
I have tried running as Admin and cannot seem to figure out what is wrong. Log files seem to be non existent. Is there anyone who has the same problem and found a solution?
This was a bug and has been fixed in 0.1.76.
See https://bugzilla.xamarin.com/show_bug.cgi?id=58319 for details.
Download the newest version here: https://marketplace.visualstudio.com/items?itemName=Xamarin.XamarinAndroidSDKManager

The iOS SDK version '...' is not installed, and no newer version was found

I get the error after updating Xamarin in Visual Studio which I had to do after a git pull. I have also applied the Xamarin updates in Xamarin Studio on my Mac build host. (Xamarin Studio > Check for updates).
The iOS SDK version '9.2' is not installed, and no newer version was found.
You can also modify the SDK version of your iOS project from visual studio in order to support older SDKs where you cant update the XCode or SDKs.
Open iOS project properties from Visual Studio.
Open iOS.Build tab
Set SDK version to 'Default'
Set Link Behaviour to 'Link Framework SDKs Only'
Save and Run the project
XCode needed updating to get the latest SDK.
The App Store told me there were updates, and mentioned SDK 9.2 in the summary so I updated.
It appears the cause was a commit on the csproj that bumped the SDK.
You can manually edit .csproj file and replace <MtouchSdkVersion>9.2</MtouchSdkVersion> with the version you actually have on your mac. This can be a solution when you use an old OS which does not offer updates for XCode.

How Can I Prevent Xamarin Studio from Downloading Older Mono Updates?

I am running Xamarin Studio 4.2.4 on Beta update channel on OS X. I have just installed Mono 3.4.0 MDK. After the update, I started Xamarin Studio and it correctly defaults to the new Mono version.
Sadly, it also opened the 'check for updates' dialog and started downloading Mono 3.2.6 MDK.
Is there a way to prevent Xamarin Studio from downloading older versions of Mono, or disable downloading of Mono updates, while still allowing other updates (Xamarin.iOS, etc) to be downloaded?
I went to Xamarin Studio > Check for updates... and disabled the Check automatically option.
I've also joined the "alpha" update channel, which currently supports Mono framework 3.4.0.

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