Right after the purchase, you'll be able to download your package archive (usually by Google Drive or Dropbox link). The archive should contain .h2npackage file
2. Connect your Hand2Note account
You need to link your account to the application, in newest Hand2Note 4.1.x just login in the app with the same email you used to create your account in Hand2Note 3.
3. Import your package
In the top menu, click Configuration → Import Package.
Select your .h2npackage file and then restart Hand2Note.
4. Finally, in the top menu click Database → Clean & Rebuild Statistics
