How to install Calendar

I’m a complete beginner. I recently subscribed to Nextcloud at home using one of their partners for server space.

I went onto the Nextcloud app store and saw an app for Calendar, which I downloaded onto my Ubuntu PC. I can’t figure out how to install this app. I’m not even sure if this is an app that will install on my PC like any normal app, or will it be a web-based app that should be installed on my server?

I’m quite confused and would appreciate any help with this.

Thank you kindly.

No… that app is to be installed on the server. Not on your computer. If this is a hosted system, you may not have access to install apps on it.