first of all… I’m a little confused… isn’t the update from 10 to 10.5 only 35,99 EUR? or do you mean Artist to Pro?
a few things I’ve read that might help:
- make sure your elicenser software is up to date
- make sure to let it (elicenser app) “perform maintenance tasks” on startup
- did you enter the activation code in the elicenser app?
I just purchased the pro version from the trial with the same promotion as well (except purchase instead of upgrade) and just had to enter the activation code i received in the email into the elicenser app and then everything worked fine. I wouldn’t be surprised if there was some strange license cache issue going on with your previous version though…