Cs Cart V4.3.x Not Ie / Windows 8 Friendly?

This topic is actually a follow up on a previous similar named post

CS Cart Not IE10 / Windows 8 Friendly?

We run V4.3.3 and we quite often receive calls from customers claiming not to be able to logon or register. Inquiry learns that most of then use IE9 or 10 on various PC's running MS OSses ranging from Windows XP, Windows 7 and 8.

The 8.1 customers and 10 are doing pretty well but the former do not.

I implemented the suggested fixes by EZ-MS but it still a customer claims not to be able to login.

Does this sound familiar to CS Cart store owners using V4.3 and customers using these older OSses like XP and IE8, IE9 / IE10 on Windows 7 or 8 machines.

PS I do not have heard from customers using Firefox, Chrome or Chromium based browsers on Apple MacOS, iOS 7 and later, Android 4.3 and later and various Linux distro';s

Getting truncated Zip file messages when try to unzip zip file for free trial. System is FreeBSD 10.2 with latest mysql and php running. can I get the .tgz version for trial. We are ready to purchase CS-Cart and Product Designer add-on, but want to be sure it works. Experience -- FreeBsd adminstrator over 20 years. Former dialup and wireless ISP.