Every anti-virus program occasionally has what is known as a false positive.
Anti-virus programs have two methods for deciding a program isn't safe. The first are "signatures", which are how they recognise a file they've seen previously. The second is "heuristics", which is when they don't recognise the files they scan and thus have to find other ways of deciding whether to trust them. One example of behaviour the anti-virus program looks at is whether the software attempts to modify other files (games can do this when updating save files, or when you make changes in the settings menu).
If your anti-virus program flags Last Epoch as suspicious, the best way of attempting to verify whether this detection is accurate is by uploading the .exe file to VirusTotal. This website will have multiple programs perform a scan and report the conclusions of each. If the detection rate is very low, then they are almost certainly false positives.
To have an anti-virus program trust Last Epoch, you can add it as an "exception" or "exclusion". How you go about doing this varies between anti-virus programs. As a courtesy, we've collected links to the official instructions for some popular anti-virus programs.
- Instructions for AdAware
- Instructions for Avast!
- Instructions for AVG
- Instructions for Avira
- Instructions for BitDefender
- Instructions for BullGuard
- Instructions for Comodo
- Instructions for F-Secure
- Instructions for Malwarebytes Anti-Malware
- Instructions for McAfee
- Instructions for Norton
- Instructions for Panda
- Instructions for TrendMicro
- Instructions for Windows Defender