For most users: . Vita3K regenerates workbin automatically. Repacking is only for:
Handling files for the emulator often involves managing .pkg files alongside their corresponding work.bin (license) files. If you are looking to "repack" or properly prepare these files for installation, Understanding the work.bin File
Once you have your repacked file, installing it in Vita3K is straightforward:
Playing PlayStation Vita games on your PC or Android device using the Vita3K emulator