Question about today's app store

Is the app store for OSMC still able to be accessed through an original Apple TV? If so, whenever I go to the “App Store,” button, it doesn’t do anything. Am I suppose to use the account I set up on this website to access the App Store?

Unfortunately it is no longer available.
We still keep the apps in the repository but removed updating and installation functionality as Apple TV support is now EOL.

Sam