Good afternoon Klrskyz,
Welcome to the Apple Support Communities!
I understand you are getting a pop-up window asking you to approve an Installer app on your MacBook Pro. Try starting your computer in safe mode and see if you can get past this:
Use safe mode to isolate issues with your Mac
Before troubleshooting, always make sure you have a backup of your computer
Back up your Mac with Time Machine
Then, open System Preferences > Users & Groups and sign in. Click the Login Items tab and make a note of the items you find there. These are apps that will start up when you restart your computer. Delete all of the items in your Login Items list. Look for the items that you are unfamiliar with in your Downloads folder and remove them from there as well.
Set up users, guests, and groups on Mac
How to block pop-ups in Safari
Take care.