If you are asked to continue installation without flag settings in Roblox, first clean Roblox App Data and see if it helps. More fixes here.

Every Way to Fix Roblox Not Installing on Your PC It’s difficult to pinpoint the exact cause of the problem, so what we’ve done is create a series of steps that’ll touch on every possibility.

If Roblox Marketplace is not working or loading and you see If you are having trouble loading Marketplace message, then see this post.