how to use laravel collective package v5.4 in laravel v5.7 - laravel

I am using laravel 5.7. I want to use laravel collective package. But latest updated laravel collective package is 5.4. When I am trying to install from composer it shows error :
' [UnexpectedValueException] Could not parse version constraint
:5.7: Invalid version string ":5.7"'
Please suggest now how can I use collective package in laravel 5.7?

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Is it possible downgrade from laravel 7 to laravel 5.8?

I need to do the same project but i need to downgrade the version from laravel 7.* to laravel 5.8 because in my project is required php 7.1 ( I know this is not good but my boss want to do for a client )
Thanks
it is easy to do
first backup your laravel 7 project
second fresh install laravel 5.* in your machine.
and then copy your app , resource , routes and packeage.json and then fire command
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if any error than solve one by one

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Good day,
I am getting a class not found error on our website.
Class 'BootForm' not found
However when I checked the vendor directory, the files are there.
So I ran this command.
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The site that uses the same dependency was this version.
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The site that is not working was this version.
Laravel Framework 5.4.35
And when I check the files, the working site had this file.
bootstrap/cache/packages.php
Does that mean that I have to update the laravel version?
In laravel 5.5, a new feature was add called Package discovery
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This plugin is easy way to integrate Category management
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[Symfony\Component\Debug\Exception\FatalErrorException]
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I am new to laravel framework,after some search I decided to use laravel 5.1
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