Had the same issue. Submitted ticket. Response: “This is a known issue from our side. However, this issue should be resolved as our developers has released an updated version of Kaspersky Safe Kids. Since the issue is still occurring on your side, we will have this escalate to our experts in Moscow HQ for checking. Once we have heard from them, we will get back to you.” I had installed this on W10 v2004. Thinking it might be a Windows issue with the new W10 update, I wiped the machine. Reimaged with W10 v1909, installed Roblox - tested ok. Installed KSK, Roblox - test failed (received the same “Error starting game” error) - with a fresh OS and fresh install of Roblox and KSK. The only 2 workarounds for now is to shutdown KSK, or pause KSK for one of the allotted time selections (1hr, 4hr, etc)