Updating from V10 to V11 may have caused problems for some users.

Generally the simplest fix is reinstalling using our offline installer which can be downloaded here https://recursiontracker.com/?p=get

If you are still getting an error message on startup you may also want to try lowering or disabling or adding us as an exception to your anti virus (Including Windows Defender). While we try to make sure we don't send any false positives against the majority of av clients, it may not be perfect.

Finally, check out our general troubleshooting tips here https://recursion.tk/content.php?129-Troubleshooting