Hi!
From today until next 27th november, you can get the GuancheMOS plug-in with a 20% off using the coupon Blackfriday2017 (actually, the disccount applies on all products added to the Cart).
GuancheMOS is the serial number generation/validation engine already used by dozens of Xojo developers, and can deploy Desktop, Web and Console apps (32 and 64 bits) for macOS, Windows and Linux
If you prefer, you can also purchase GuancheMOS with a 20% off from the Xojo Store.
Javier