COMEA COME APK file has no Open action
Use the browser's Downloads view or the Files app to inspect the saved item; an absent notification button does not prove an installation failure.
Work through this situation
A browser can offer Delete or Share while Android handles installation elsewhere. Verify the file is complete and the extension is an APK before choosing an app to handle it. Do not convert it into a document to force it open.
What to check and why
Read the item's name, file type and completion status before selecting an action. A menu without Open can belong to a download notification, a file manager or a share sheet; those are not interchangeable. Close the share sheet if your goal is installation and return to the actual saved file.
If Android cannot handle the item, preserve its exact message. An HTML page saved from the browser is not an APK, and changing its extension will not help. For an identified APK, the intended browser or Files app may hand it to Android's installer. A later installer rejection is a new stage to investigate, not evidence that the missing notification button caused the problem.
Keep acquisition and installation separate
The COME button on this website opens the external app page. Saving a package, installing it through Android and opening an account are later steps with their own results. Use the browser record for transfer questions and the Android message for installer questions. A repeated visit to the first page does not automatically repeat or repair every later stage.
What a completed answer looks like
Android receives the intended completed package or gives an exact message you can investigate.
Continue from the stage you have actually confirmed. Preserve the exact message when a step remains unresolved.
Choose another specific COME guide