Please note:

• We highly suggest you not to run Blitz as Administrator, unless the game you're wanting to play also runs as Administrator. 
• Video is available in the bottom

Option 1:

Click on the Elevate button

Option 2:

Step 1

Open the Run window

• A fast way to do this would be by pressing Windows Button + R

Step 2

Type %localappdata%\Programs\Blitz

Step 3

Click OK

Step 4

Click OK

Step 5

Head to the Compatibility tab

Step 6

Click Run this program as an Administrator

Step 7

Click on the Apply button

Step 8

Restart your system.