Could you follow these steps to reinstall your Studio?
It should fix the issue. It might be that something is also blocking your connection to our licensing servers.
A longer path would be to try and provision a robot from our Cloud Orchestrator and get the license this way.
It seems to be an issue that needs to be solved, as per all those topics (maybe extra clues in those as well): Search results for '"to execute processes, please activate a license"' - UiPath Community Forum
Anil_G
ashokkarale
jinal.shah
Gautham_Pattabiraman
postwick
chandreshsinh.jadeja
vrdabberu
Ajay_Mishra
sven.wullum1
Vyshnavi_Nalumachu