The Fixed Period Membership Add-On allows your Subscriptions to end at a specific date, no matter when a client subscribes to it.
Fixed Period Membership is a Basic add-on, available with a Paid Member Subscriptions Hobbyist or Pro license only.
After purchasing the add-on, the .zip file will be available for download under your account page by clicking the “Add-ons Download” button.
Once downloaded, you can install the add-on as a normal WordPress plugin, by uploading the .zip file in your WordPress Admin -> Plugins -> Add New -> Upload Plugin.
Alternatively, you can install the Fixed Period Membership add-on by extracting the folder found inside the archive and uploading the entire folder via FTP to your /wp-content/plugins folder found inside your WordPress install.