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#861429 FM26 3D Stadium Megapack
TheGreatHadoken
No you don't, you just do what the prompt says. No need to uninstall anything at all. Happens to me when I have my PS4 controller plugged in and running through DS4Windows to trick the PC into thinking it's an Xbox controller. It's some sort of anti-0tamper check, and the response code the prompt leads you to will fix it immediately, but you may need to keep doing it. Uninstalling won't fix anything more than following the prompt and entering the response code already does. You'll just end up back at that message after re-installing everything and loading up again, at some point, if not the first time.
#861085 FM26 3D Stadium Megapack
TheGreatHadoken
That happens with or without this mod. Do what the prompt says, click next, follow further prompts.