A Keepsake Sound product
Logic Pro scans for new Audio Units when it starts, so give it a restart and Heirloom will be under Keepsake. Other hosts may need a rescan of their plugin folders before it appears.
Heirloom needs its library, the file called Heirloom.ksbank. If it
was already in your Downloads folder this installer has pointed at it and there
is nothing left to do.
Otherwise the plugin will say it cannot find the library. Use Locate Bank, choose the file wherever you keep it, and that is the last time it asks.
Enter your key inside the plugin. It stays activated after that, including through updates.
Thank you for buying it. If anything is wrong, keepsakesound.co has a way to reach us.