I am sorry to hear about the problems you are running into.
v.2.0.0 is the current version, but it cannot be used with AT4.
As this is primarily a user to user forum, not official Technical Support, other users may chip in. But please remember that the same symptoms do not necessarily mean the same problem.
Meanwhile, the best thing to do is
contact Support, via here. If Searching the FAQs does not help there is a
red button link to the Technical Support form, for some one to one investigation and help. Response time aims to be within 2 working days (US (East Coast) Business hours, generally), but in the current circumstances please allow some more time.
And, to help others who run into a similar problem, please let us know what you did to resolve the problem. Please do not quote directly any correspondence from Support, as that may apply only to your particular circumstances and may lead others down the wrong track.