Online activation no longer works

Your activation server no longer supports TLS 1.0 and activation fails on WinXP.

You should put system-independent TLS 1.2 implementation in the installer and not depend on the system for that.

Are you still using Windows XP for development?

Yes, for some projects. It is impossible to move everything to more recent system as quickly. I have to update TMS components on that system too and I am unable to do so (except for activation by email which is a real pain).

You can install on a normal operating system and move over the installed source files to this old machine. 
We have no plans to revise our installer for defunct operating systems.