Same issue
An error occured while updating ATLAS (missing executable) :
S:\Steam\steamapps\common\ATLAS\ShooterGame\Binaries\Win64\AtlasPTR.bat
It tries to DL something each time i start the PTR but nothing changes.
Files all verified.
EDIT
If you have this issue make sure your beta opt in is set, mine had defaulted back to none, once i changed to PTR i got a DL and all is good.
Hang in there everyone, change is good, it will make for a greater game.
Get some stuff done IRL knowing there will be a kick ass game to come back to.
Guys at grapeshot, you can do it, I have faith.