Neo 5K does it only come with one licence?
 

I don't remember seeing anything that says that with the free upgrade from Prospect HD to Neo 4K we only have a one machine license. Is this the case?
Having finally managed to find the time to install Neo I was a bit annoyed when my first machine failed to uninstall Prospect properly and crashed the uninstaller during the process. I think I managed to tidy it up OK and its working now. I then tried to license my second machine but my authorization was rejected. Neo 4K is not going to be a lot of use if I can only use one machine at a time.
I do a lot of 32 bit compositing in AE and used two machines with Prospect, one to work on and one for rendering. Renders can take several days at a time.

Ping support, problem will be solved.