Extend a license subscription
The subscription period is the period when you can use PVsyst in licensed mode. After it expires, PVsyst will switch back to a limited mode.
Buy a subscription extension
To extend the subscription for an existing license, visit https://www.pvsyst.com to check prices and purchase online.
Refresh your license to update the subscription period
To apply the extension you purchased you simply have to synchronize your license.
Result: your license is now up to date and you can install and run the latest PVsyst update. Follow the software update procedure to do so.