The app is new and not yet signed with a paid certificate, so Windows SmartScreen may show a blue 'Windows protected your PC' window. It is not a virus — the app is safe.
Windows protected your PC
Microsoft Defender SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk.
App: Counterplay-win-Setup.exe
Publisher: Unknown publisher
More info
Run anywayDon't run
1Click 'More info' in the warning window.
2Click 'Run anyway'.
Counterplay never asks for your Riot login, works only during the draft phase, and never interferes with the game.