The following AutoIt test confirms the binaries of both the files to be identical.

Local $sFileName_1 = @ScriptDir & "/AutoMathEdit.zip"
Local $sFileName_2 = @ScriptDir & "/DETECTION TEST/AutoMathEdit.zip"

Local $hFile_1 = FileOpen($sFileName_1, 16)
If $hFile_1 = -1 Then
	ConsoleWrite("Failed to open $hFile_1" & @LF)
	Exit
EndIf

Local $dBinary_1 = FileRead($hFile_1)
If @error Then
	FileClose($hFile_1)
	ConsoleWrite("Failed to read $hFile_1" & @LF)
	Exit
EndIf
FileClose($hFile_1)

Local $hFile_2 = FileOpen($sFileName_2, 16)
If $hFile_2 = -1 Then
	ConsoleWrite("Failed to open $hFile_2" & @LF)
	Exit
EndIf

Local $dBinary_2 = FileRead($hFile_2)
If @error Then
	FileClose($hFile_2)
	ConsoleWrite("Failed to read $hFile_2" & @LF)
	Exit
EndIf
FileClose($hFile_2)

MsgBox(0, "Binaries are the same", $dBinary_1 = $dBinary_2)

I installed Malwarebytes and nothing was detected on the memory stick. Regarding the download problems, I’m wondering if I might be better off using 7zip.