by garfy » Sun Dec 30, 2018 11:30 am
Hello alexmil2000 and welcome to the forum.
I've just had a look in my User Area and the earliest version of AT3 I have access to is 3.1 so I'm afraid I can't help you with any missing version questions.
If it's any help, in the description of version 3.5.2 it says "Multiple windows opening when launching AmpliTube 3.5.1 on OS X 10.5.x has been fixed" which suggests that 3.5.2 should work with your OSX10.5.8, but obviously I cannot confirm this.
As this is a user-to-user forum and not direct to IKM support, you should raise a ticket with IK official support here
https://www.ikmultimedia.com/contact-support/mi/ in case no one else chimes in here with advice or a solution.
Hope that helps.
System Specs: 2012 Mac Mini 2.6 i7 & 2015 MBP 2.2 i7, 16GB RAM
macOS10.15.7 Logic 10.6.1 Reason 11
Various IK, NI, Waves, Softube, Eventide, XLN software
Focusrite 18i20 x 2, Novation ReMote 25SL