If the app will not open
Check that the download is a Mac application and that its listing supports your macOS version. A Windows executable does not become a native Mac app by changing its filename. For an App Store installation, start with the installed copy in Applications.
Note the exact error message. An installation or compatibility issue happens before the click engine is running, so adjusting the interval cannot resolve it. Use the support link on the current listing if the app continues to fail at launch.
If the app runs but no clicks arrive
Review Accessibility access in System Settings → Privacy & Security → Accessibility. Confirm that you enabled the app copy you are launching, then reopen it if instructed. Use a slow, finite test before trying the original workflow.
If a basic local target works but one application does not, the difference points to the target, its focus or its handling of synthetic input. Do not assume that increasing permissions will make a restricted target accept automated actions.
If clicks land in the wrong place
Bring the intended window into view and check where the pointer is positioned. A click is not the same thing as recognition of a named button. Moving a window, changing its size or opening a dialog can change what sits under the pointer.
Use a small test count so you can inspect the result. Avoid testing on purchase, send or delete controls. Once the target is stable, change one setting at a time so the reason for an improvement remains clear.
If clicking stops early or the hotkey fails
Check the configured repeat count and any free-use limit. A sequence ending at its selected count is different from an unexpected crash. Review the app’s current status message rather than assuming every stop is caused by macOS.
For a shortcut problem, check whether another app uses the same key combination. Test the on-screen start/stop control separately from the shortcut. If one works and the other does not, you have narrowed the issue to how the shortcut is being handled.
Keep a useful test record
Write down the app version, macOS version, interval, repeat count, target application and which control failed. Describe what you expected and what actually happened. Do not attach unrelated private documents or account details.
For OP Auto Clicker - Fast Tapper, start with the app’s supported interval, repeat and shortcut controls. Free use is limited. The App Store listing provides the current compatibility and support entry points.