If we want to rule out Kaspersky, try temporarily uninstalling Kaspersky, rebooting the PC. Then repeat the installation of the celeste.zip. If the game still doesnt run, after hitting play, It definetly isnt kaspersky.
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.