Why can't Apple 15 have a perpetual calendar?

Apple150 calendar cannot be downloaded for the following reasons:

1. System compatibility issue: Apple 15 may not be suitable for some specific versions of the calendar application. You can try to update your operating system or wait for the developer to release an update suitable for the system.

2.app store problem: Sometimes, there may be technical failure or maintenance in the App Store, which prevents you from downloading applications. You can try to restart the device and try downloading again.

3. Regional restrictions: Some applications may be restricted by regions and can only be downloaded in specific countries or regions. You can check whether your area is restricted.

If you still can't download the perpetual calendar application after troubleshooting the above problems, you can try to contact Apple customer service or application developers for help.