if you're using win10 you may notice that idlemaster can't detect steam running status

use search function to find IdleMaster.exe (NOT shortcut) and Run it as Administrator

if it's work idlemaster will be able to detect steam runnning status

It should be in AppData > Local > Apps > 2.0 > some folder but NOT Data folder > another folder (only one folder in this step) > idle..tion_(some number and alphabet) > there you are

or just use search like i said