Hi! That sounds like an antivirus issue. Try adding exclusions for these three folders:
(the game's installation folder)
%userprofile%\Documents\Spartan
%userprofile%\AppData\Local\Temp
Could be two things. Either you are not setup for multiplayer in general, or you are not using the Beta.
Here is a tutorial on how to setup multiplayer
And to enable the Beta Update option (which is required for Sparta as of now), head to the celeste launcher and click on the hammer icon. Then...
New to the conversation on this one, but im not sure that this would do alot of good. Either that, or the ratio of how much effort it'd take (not that effort is necessarily a huge problem) is disproportional to the amount of good it'd do.
Hello! Someone posted this in the discord too. (It might of been you, I cannot remember)
Here are some things I suggest you try:
Manual update to the latest version of the launcher. You can follow my video here to do so.
Check all antiviruses you use, and exclude the following directories...