Hi Ilyian,
For offline license activation in SnapDevelop 2019 R2, it requires PowerBuilder 2019 R2 offline license activated on the same computer. Then:
1. when you launch SnapDevelop by clicking the SnapDevelop icon in PowerBuilder IDE, you are automatically logged in to SnapDevelop with the account that you use to log in to PowerBuilder IDE;
2. If you launch SnapDevelop directly from the Windows start menu, you can select "Activate without internet" link in the SnapDevelop login window to activate SnapDevelop directly with the same offline license.
You can also refer to the document in the link below for more information on activating SnapDevelop:
https://docs.appeon.com/appeon_online_help/pb2019r2/appeon_license_user_guide/activating_snapdevelop.html
Regards,
Aubrey