Is it a mod compatibility issue?

No

If it's a mod compatibility issue, please provide the link(s) to the incompatible mod(s)

No response

Minecraft version

1.20.2

Describe the issue

I can't even run the installation file, immersive-portals-4.1.4-mc1.20.2-fabric.jar. If I double-click and click past the warning from Windows, nothing happens. If I run it in the terminal, like so: java -jar .\immersive-portals-4.1.4-mc1.20.2-fabric.jar, I get this error:
no main manifest attribute, in .\immersive-portals-4.1.4-mc1.20.2-fabric.jar
I'm definitely missing something obvious here, thank you

search how to install fabric mods, you don't need to open the jar files, you need to put them in the mods folder

apologies, i've never installed a fabric mod before! thank you