I've tried everything I can find online to remove the popup that says
'"ReceiverHelper.app" will damage your computer. You should move it to the trash.'
I press the button "Move to trash" and am met with "This item cannot be moved to trash. Please move to trash manually."
The item does not exist as far as I can tell.
Looking for new ideas.
Thanks for reaching out nimzocowboy,
It sounds like you're encountering a pop-up message advising you to move a file to the trash on your Mac. We can help.
It sounds like this may potentially be adware. You can check out this article to learn how to Block pop-up ads and windows in Safari:
Avoid interacting with pop-ups
Unless you’re confident that they are a legitimate ad, avoid interacting with pop-ups or webpages that seem to take over your screen.
* If you see an annoying pop-up ad in Safari, you can go to the Search field and enter a new URL or search term to browse to a new site. If you don’t see the Search field on your iPhone or iPad, tap the top of the screen to make it appear.
* Some pop-ups and ads have fake buttons that resemble a close button, so use caution if you try to close a pop-up or ad. If you're not sure, avoid interacting with it and close the Safari window or tab.
* On your Mac, you can quit Safari, then press and hold the Shift key while opening Safari. This prevents Safari from automatically reopening any windows or tabs that were open.
Update your software
Always install the latest software updates for all of your Apple products. Many software releases have important security updates and may include improvements that help control pop-ups.
The safest way to download apps for your Mac is from the App Store. If you need software that isn’t available from the App Store, get it directly from the developer or another reliable source, rather than through an ad or link.
Check Safari settings
On your iPhone or iPad, go to Settings > Safari.
* Turn on Block Pop-ups.
* Turn on Fraudulent Website Warning.
On your Mac, open Safari and choose Safari > Settings (or Preferences) from the menu bar.
* In the Websites tab, you can configure options to allow or block some or all pop-ups.
* In the Security tab, turn on the setting to warn when visiting a fraudulent website.
If adware or other unwanted software is installed on Mac
If you see pop-ups on your Mac that just won’t go away, you might have unintentionally downloaded and installed adware (advertising-supported software) or other unwanted software. Certain third-party download sites might include software that you don’t want along with the software that you do.
If you think that you might have malware or adware on your Mac:
* Update to the latest version of macOS. If your Mac is already using the latest version, restart your Mac. macOS includes a built-in tool that removes known malware when restarting.
* Check your Applications folder to see if you have any apps that you don't expect. You can uninstall those apps.
* Check the Extensions tab in Safari settings to see if you installed any unnecessary extensions. You can turn extensions off.
If you continue to see advertising or other unwanted programs on your Mac, contact Apple.
Hope that helps.
Take care.
That specific advisory is covered in this Apple supoprt article:
Safely open apps on your Mac - Apple Support
You are seeing GateKeeper at work.
ReceiverHelper.app
