1. On the github page, click 'Raw' in the top right hand corner
2. Save page as.... "Apple_Software_Update_Search_v2.sh"
3.Go to your Jamf instance: Settings > Computer Management > Scripts
4. Click the '+' in the top right
5. Copy the contents of the script (open it in your favourite text editor) into the main window
6. Enter the name of the script in the title bar
7. Click onto the 'Options' Tab
8. Paste the following into parameter fields 4: "Update Selection (Required)"
9 Paste the following into parameter fields 5, 6 & 7: "Update Selection (Optional)"
10. Click save in the bottom right
The script requires that you provide at least one parameter of an item that you want it to check if there's an update. You can add these parameters when you attach the script as a payload in a policy.
I suggest that you spend some time working through these online videos that Jamf have provided as you have asked this same question twice on this forum. I think you need to learn some of the fundamental concepts that these videos convey:
https://trainingcatalog.jamf.com/
