@Noctusxx: First matches in internet search people always report that updating their graphic card driver or increasing the page file size in Windows solved it.
Btw: is there another .NET crash entry or just this one? If just this one then don't mind.
[Edited by 0x90, 8/3/2021 11:19:41 AM]
Ah, well thank you for looking into it.
Updating graphics drivers and trying different page file sizes has had no effect on the issue.
But the trainers still work separately as long as I have an offline key installed, as they recently stopped finding your servers despite adjusting the DNS settings and whitelisting as others had suggested. So I will just give up on trying to use the manager software for now. When I see the next version come out I will give it a try to see if there is any change.