Currently, the only product available via https://buy.solibri.com/ is the Solibri Office as an individual annual subscription. This version of Solibri Office is not supporting extensions as it is not integrated with Solibri Solution Center (SSC).
Solibri perpetual licenses, on the other hand, are available to both Solibri Office and Solibri Site products, and extensions are supported. The perpetual licenses can also be assigned to multiple users in a user pool, while the subscription license is for individual use. If you're interested in perpetual licenses, please contact us.
The annual subscription of Solibri Office is billed monthly, while the perpetual license is billed at once.