1. there is an older version that basically is the most stable build, can be downloaded at https://github.com/MediumCraft/mcMMO/releases/download/2.1.218/mcMMO.jar
2. this plugin is tested in 1.19.3, works just fine
3. I will need logs to try and fix this error, so please send the full server log
4. if you have anti-cheats, that is a already known issue
5. there is a new update that I just got, try it out and see if it works for you
Contact me if there are any other issues at discord
Discord: HansLee#4775
@Tonystark99 It's mostly safe but you should still use caution. Some plugins from this website have been known to contain backdoors that allow the creator to take full control of your server. I know because I have personally experienced this in the past.
@Tonystark99 Your PC won't get directly hacked through plugins, unless you're running a local server from your router with port forwarding on, which I do not recommend doing. I have myself in the past and someone got into my router and changed all the settings. As for downloading plugins, if you're not sure about something you downloaded and you find yourself second-guessing it, I recommend dragging and dropping the file into VirusTotal to be safe. If there is anything suspicious, VirusTotal will find it.
It gets the latest file from the repository and you can download the latest files there.