How i can link old account to steam account while i deleted old pso2?

if it is possible , cuz i dont want waste another 60 gb on only linking accounts i need answer how i can link to steam version from original

You need both versions to do the account link since the authorization code you get from the MS Store version is only valid for 15 minutes, as noted here: https://pso2.com/news/announcements/steamlinkaccounts

If you are using the Tweaker, then there is a way to use the same install for both the MS Store and Steam versions (thus not needing to download/install a second copy), but if you are using an install directly from the MS Store, then you need to have a separate install for the Steam version.

After you link, however, you can uninstall the MS Store version with no problems.

oh so basicly i cannot do it how i wanted so i must waste another 60GB hmm thanks for info '^'