Do you still have the old PC? Did you create a backup file before uninstalling?
Is PostgreSQL (the program where PokerTracker 4 stores your poker data) still installed on the old PC?
If you still have the old PC and PostgreSQL is still installed you can reinstall PokerTracker 4 there, create a backup of 'User Data Files' under 'Optional Files' and then transfer and restore that to the new PC:
Guide: Backup & RestoreManual hand/player notes are stored in the database so transferring those will need a backup/restore of the original database(s) or you can export notes separately via the 'Database -> Notes' option.
If you still have the old PC but deleted PostgreSQL you can transfer HUD profiles and filters manually by transferring this folder:
C:\Users\{Windows Login}\AppData\Local\PokerTracker 4\Databut that will not transfer manually created player/hand notes.