My Mac won't allow me to open Sysphytum because it's not from the App store. Can't find it on the App store. How do i get around that?
We really should have a pin for this, because it comes up all the time.
instead of double clicking on the new app, right-click on it (or Control-click if you have a single button mouse) and choose Open.
You will get another warning that the app is from an unidentified developer. (This DOES NOT mean that it is a dangerous app, it just means that the app or it's developer isn't registered with Apple. If you got the app directly from it's developer it is most likely completely legitimate.)
However, now you are given the option of opening the app anyway.
Click Open in the dialog box. If prompted, enter an administrator name and password. You should not have to go through this process again to open this particular app; it will remember that you gave permission for it to be opened.
How to open an app from a unidentified developer and exempt it from Gatekeeper
Safely open apps on your Mac - Apple Support