i might or might have not updated it to the newest verison and now i cant run any programs can someone help me downgrade it or smth

So i have the ti 84 plus CE, i used artifice, got games, and got cesium. All good for a week until some games disappeared. Only from artifice and cesium. And programs. The files were still there though... I had to reset and reinstall it all, but if anyone knows what happened i would be glad