Discovered the problem after installing TT on my wifes Windows 11 Home PC. During the install it wanted to install a C++ file and everything went fine with the install and activation. Even though I'm running Windows 11 Pro and supposedly all up to date, I went to MS and downloaded the latest C++ and then tried running TT again, it worked! No errors, signed in, and activated without a hitch. Something you should pass on to others, make sure all your MS Visual C++ redistributables are up to date.
Thanks for your help, even though it didn't really help.
