Hello Aristotelis B.,

Try to follow these steps:

Please check if under C:\Users\ The Admin username \AppData\Local\Incomedia\ there is a folder called WebSite X5 v12 - Professional and if the licence.iwl file is inside this folder.
If this folder exists and the file is there, copy the folder and paste it under c:\Users\ Your Windows username \AppData\Local\Incomedia and then start the program.

Many thanks!