can't update some 3rd-party apps

[rtkatz]

I can't update applications like malwarebytes or other 3rd party apps that have internal updates. Which setting needs to be reversed to make that possible again?

[TraderStf]

I don't have this problem.
Take a look at your firewall, syst-pref-security.

Download LockDown from https://objective-see.com
You will be able to easily switch on or off the options you want.