Certain games not installing and I dont know how to fix it

A while ago I installed quake 2 and for some reason I uninstalled it and tried to install it again but nothing happens (Just for context). Now I've been trying to download Rainbow Six Siege and nothing happens when clicking installing, last time I've played it was before it got upgraded and enhanced. I've tried hard resetting and everything but nothing works, can anyone help me fix incase it happens to more games?