February 2019 - last edited February 2019 by holger1405
Hello,
I have downloaded Sims 4 to a new computer. But when trying to start is I get an error message saying "Can't open as Sims 4 is already running on this computer." I have tried uninstall and installed again, and I have tried to reboot but nothing works. The computer has Windows 10.
What shall I try now?
On my old computer also having Windows 10 this was never a problem.
February 2019
Look at this guide. Should solve the problem. If not just let us know.