Troubleshooting
Application integrity warning.
What to do if popCalendar reports that the application is corrupted or its integrity cannot be verified.
Do not bypass an integrity warning by disabling security checks or changing the app's signature. If macOS says the app will damage your computer, stop using that copy and follow the macOS warning.
What the warning can mean
The app's files may be incomplete, damaged, or different from the original copy. An integrity warning alone does not establish the cause or prove that malware is present.
Tools that remove languages, processor architectures, or other resources from an app bundle can also break its integrity. Avoid changing files inside popCalendar.app.
Apple explains these alerts in its guide to safely opening apps on your Mac.
What to do next
- Quit popCalendar. If you obtained the app directly from the developer or the Mac App Store and have not modified it, you can try opening it once more. If the warning returns, leave the app closed and continue below. Do not retry a copy that macOS identifies as harmful.
- Replace the affected app. Move only popCalendar.app to the Trash and install a fresh copy from an official source linked on the popCalendar homepage. Do not delete your calendars, preferences, or Library folders as part of this step.
- Check cleanup tools. If an optimizer or app-slimming tool changed the app, exclude popCalendar from those changes before opening the replacement.
Download a fresh copy of popCalendar from the Mac App Store. If you received a development build, contact support for a replacement.
Still seeing the warning?
Email support@apptrust.app with your macOS version, popCalendar version, where you obtained the app, and the exact warning. Mention whether it happens again after restarting and whether a cleanup tool recently changed the app.
Leave out private calendar details. You can also visit the support page or browse open issues on GitHub. GitHub issues are public.