Starting from version 4.0.9 of the RAM Disk, there is an option to suppress further notifications.
In earlier versions, the notification pops up once every 3 months and does not affect the functionality of the RAM Disk in any way. If it is still undesirable, you can disable the notification via Windows registry:
- Make sure the RAM Disk app is not running: quit it via File - Exit in the main menu.
- Download this registry file, unzip it, and then import it by double-clicking the contained REG file. This will postpone the next reminder until year 2050.