I enter the Aquarium version 3+ serial code, select the fish I want to see (16 in all), then run the screensaver and all works correctly for several days (sometimes a couple of weeks.
Then afer a week or two of running normally, the program reverts to a demo, and I have to re-enter the serial number and re-select the fish? This happens regularly!
I am running Windows 10 home edition with an AMD Radion high definition graphics card and 32 gig of ram on dual 24 inch monitors with 3 hard drives, two internal (1 ter and 2 ter) and one external 2 ter.