Hello, igedesign. Let me help you with your concern on behalf of my colleague Archie.
 

I've checked with my tools, and I can download, open, and use the Shopify POS. To troubleshoot the issue, check if your app store is updated to the latest version. An outdated app store version may cause interruptions to the system and prevent the app from functioning correctly. 

To update your app store, please go to your device's settings and look for the "App Store" or "Google Play Store" option. From there, you should be able to check for any available updates and install them if necessary. 
 

Once you've updated your app store, try downloading and opening the POS again. If you still encounter any issues, please contact Shopify so they can further investigate the root cause of the problem or provide you with an installer.
 

Another option is to download the Shopify app directly from their website; you can visit their official website and locate the App Store section. Once you have reached the App Store section, you can browse through a wide range of apps available for download.

We'll keep our ears open for additional queries when handling QuickBooks POS. Please don't hesitate to let us know in the comments below, and we'll get around to providing further help. Keep safe.