We've gotten reports from several players having issues launching Valkyrie Connect on Steam, and we've identified a few solutions that have resolved those issues for some. If you are unable to launch the game, please try the below steps:
・Install the game with administrator permissions
・Disable your anti-virus software/Windows Defender or add the below files/folders as exceptions:
C:\Program Files (x86)\Steam\Steam.exe
C:\Program Files (x86)\Steam\SteamApps\common\ValkyrieConnectWW
(This one in particular seems to have a high success rate)
・If a popup from "Steam Client Service" is displayed, click "Yes" to download the files necessary to run the game
・Restart your PC
The dev team is working on some possible permanent fixes but they may take some time, so for the time being please try the above!