Hi AlpixTDK,
Got it, thanks. That's because the PAK file is inside a critical Windows system folder. Try the steps suggested in the link below & see if it resolves your issue. Any errors after that, let me know.
https://support.seaofthieves.com/hc/en-gb/artic...
(Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.)
I hope this helps. Let me know how you go. Thank you!
Sincerely,
Paul A.
Independent Advisor