Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Roman,
I am Dave, I will help you with this.
Use this tool from Microsoft to remove all remnants of any previous Office Installation:
https://aka.ms/SaRA-officeUninstallFromPC
Restart (not shut down) your PC
Go to https://account.microsoft.com/services/ and re-install Office from there