Auto it how to check if window appears and close - window

Question

How do I check if a specific windoww appears in Autoit.
At the moment I am running with Auto it Adobe After Effect,
so far so good.
The problem is that a warning message pops up if the user does not have quick time installed.
Now I want to check if that window appears and is active and then close it.
So far I have this but did not work:
Local $iPID = Run("C:\Program Files\Adobe\Adobe After Effects CC 2015\Support Files\AfterFX.exe", "", #SW_SHOWMAXIMIZED)
WinWait("[CLASS:AfterEffects]", "", 1000)
Sleep(200000)
; if qicktime warning eror appears
If WinExists ("DroverLord - Window Class", "") Then
Send ("{ENTER}")
EndIf

Answer 1

Does this help?
Opt("WinDetectHiddenText", 1) ;0=don't detect, 1=do detect
Opt("WinSearchChildren", 1) ;0=no, 1=search children also
Opt("WinTextMatchMode", 1) ;1=complete, 2=quick
Opt("WinTitleMatchMode", 2) ;1=start, 2=subStr, 3=exact, 4=advanced, -1 to -4=Nocase
#include<Date.au3>
Local $iPID = Run("C:\Program Files\Adobe\Adobe After Effects CC 2015\Support Files\AfterFX.exe", "", #SW_SHOWMAXIMIZED)
If #error Then
ConsoleWrite('ERROR' & #CRLF)
Exit(0)
EndIf
Global $end = False
Do
; if qicktime warning eror appears
If WinExists("DroverLord - Window Class", "") Then
ConsoleWrite('!FOUND ' & _NowTime() & #CRLF)
Send("{ENTER}") ;close?
WinClose("DroverLord - Window Class", "") ; this
WinKill("DroverLord - Window Class", "") ; or this
$end = True
EndIf
Until $end

Answer 2

Here is an some example code of what you are trying to do:
Local $fDiff
Local $sAfterFXPath = "C:\Program Files\Adobe\Adobe After Effects CC 2015\Support Files\AfterFX.exe"
If FileExists($sAfterFXPath) Then
Local $iPID = Run($sAfterFXPath, "", #SW_SHOWMAXIMIZED)
;no need to call WinExists becuase you are waiting for it to exist and be active with WinActivate
Local $hTimer = TimerInit() ; Begin the timer and store the handle in a variable.
Do
$fDiff = TimerDiff($hTimer)
Until WinActive("Title you are looking for") Or $fDiff >= 30000 ;<<<will exit loop when the window is active or after 30 seconds
If WinActive("Title you are looking for") Then
;Closes the window now that it is active
WinClose("Title you are looking for")
Else
MsgBox(0, "", "The window was never active.")
EndIf
Else
MsgBox(0, "", "File path not found. Do something else...")
EndIf