Do you mean from the home page (zotero.org) or from the actual download page?
When your browser appears to be on an iOS device, we link directly to the store download.
You should see other options on both pages though. On the home page you should see a link to the normal download page under the download button ("Also available for Mac, Windows, and Linux"). On the main download page, alternative downloads are listed under "Other versions"
It's only showing the mobile download on the website, and the connector link that takes you to the app store says only available for mobile devices. Even when searching apples app store nothing is found.
Upgrade Storage
When your browser appears to be on an iOS device, we link directly to the store download.
You should see other options on both pages though. On the home page you should see a link to the normal download page under the download button ("Also available for Mac, Windows, and Linux"). On the main download page, alternative downloads are listed under "Other versions"