the option does not appear to activate TU

[zingierclock 1]

the option does not appear to activate TU, I can download the TUs and I can play with the TUs which I had already activated, but I can't activate new TUs because don't appear the option

[superted76 64]

I assume we're downloading from Unity for the TU's, If so why not just delete the old TU or move it elsewhere for the time being and see if the game boots the TU that you can't seem to enable. At least that way you'll have some idea of what's happening....