I have this error right after I installed the package

[Zuchor]

I made a mistake where when I installed the package, I accidently hit upgrade(the second question it asked me after I pressed import). I would like some advice and help, thank you.

[Yitzchak_Cohen]

Hi There,
Which package are you referring to?

[RoBoT]

Hello! I ran in to the same issue! Luckuly the fix is quite simple!

" Go to Package Manager . Go to the small arrow right to to the + then select Packages: Unity Registry . In the list you should find Multiplayer HLAP and then click on the right side on Up to date . I hope that helps."

Source: Getting Deterministic compilation failed After Reinstalling unity and open old project. - Unity Answers