If you have a copy of Blocs V5, you can expand Blocs to Blocs Plus right inside the main Blocs application.
In-App Upgrade
To upgrade Blocs V5 to Blocs V5 Plus, navigate to the main menu and select Help > Upgrade To Blocs Plus. A checkout popup will open and walk you through the process to purchase the Blocs V5 Plus expansion.
Once the in-app purchase is complete, Blocs will activate the Blocs Plus functionality automatically. You can find out more about Blocs plus here.