Pop up messages

Odds are it's a bogus scam meant to scare you into doing something you shouldn't.

Here's an Apple Support article on how to turn off unwanted notifications: Turn off notifications for an app or website on Mac - Apple Support

Hope this helps.

ebonie241 Said:

"Pop up messages: I keep getting notifications popping up on my Macbook that I am at risk for a virus and that someone is downloading files?"

-------

Troubleshooting Scam Notifications:

A. Uninstall Security Software:

Is Security Software telling you this? Uninstall this Security Software. Use the Uninstaller to do so, getting the Uninstaller directly from my Developer’s site, as getting it else where may result in Malware or Spyware being installed. If you are uncertain which to download, then as the Developer.

B. Scan your Mac for Malware: 

Use MalwareBytes for Mac --- This is software that searches for malware/adware. So, scan with it and then remove what is found. Once removed, uninstall MalwareBytes for Mac. Then restart the Mac.

Downloads:

1. Malwarebytes Anti-Malware for Mac
2. Malwarebytes Uninstaller

C. Try Using a New Administrator User:

See what happens when you create a new Administrator User and login to it and perform the above. If it works, then it is something mid configured in your current user. So, move everything over to this new user, and then delete this user you are currently logged into.

If none of the above work, then...

D. Restore from a Backup:

Do you have a Time Machine Backup of your Mac that you created prior to this? If so, restore form it. If not, then take this as a learning experience, knowing to always create a Time Machine backup of your Mac prior to making any major change to is (i.e. macOS upgrade), so that you can have something to restore your Mac from, should anything go wrong with the upgrade.  Important:Create a backup prior to performing this restoration.

ebonie241 wrote:

I keep getting notifications popping up on my Macbook that I am at risk for a virus and that someone is downloading files?

That’s a notification that was offered by a website or such, and was accepted.

Here is how to remoce the notifications:

Stop unwanted Notifications - Apple Community

…and also how to prevent websites from ever requesting permission to even send these again.