How to satisfy a recurrent 'Security and Privacy' pop-up?

Question

Hello, 
 I'm a new member. Joined because I've been clicking ignore for too long on an annoying pop-up and am hoping to actually solve it now. The pop-up states: 
 
 Sophos Endpoint 
 You need to change your 'Security & Privacy' settings in order to protect this computer. 
 Click 'Open Security & Privacy' and then click 'Allow' within the next screen. 
 
 In theory the next step is easy ... except there is no "Allow" option at the next screen. And so I am left with no choice but to repetitively hit "Close" to ignore the pop-up. I run 10.13.6 (High Sierra) on a 2018 MBPro, in case that helps anyone lead me to an alternative solution. 
 Thank you in advance for your time and attention. 
 ~Dave

MEric · Answer

Hi all, 
 Try the following on your Mac to see if the issue still occurs: 
 
 Restart your Mac 
 Before OS X starts up, hold down Command-R and keep it held down until you see an Apple icon and a progress bar. Release. This boots you into Recovery 
 From the Utilities menu, select Terminal 
 At the prompt type exactly the following and then press Return: csrutil disable 
 Terminal should display a message that SIP was disabled 
 From the  menu, select Restart. 
 Open Security & Privacy in the Apple System Preferences window 
 Sophos should now show up near the bottom of the window. Click Allow 
 Restart your Mac 
 Before OS X starts up, hold down Command-R and keep it held down until you see an Apple icon and a progress bar. Release. This boots you into Recovery 
 From the Utilities menu, select Terminal 
 At the prompt type exactly the following and then press Return: csrutil enable 
 Terminal should display a message that SIP was enabled 
 From the  menu, select Restart.

dan cox1 · Answer

The instructions at this link show what the Allow button should look like: https://support.home.sophos.com/hc/en-us/articles/115005363986-System-Extension-Blocked-appears-on-new-installations-on-macOS-High-Sierra-10-13-and-macOS-Mojave-10-14 
 Like everyone else, I couldn't see this either, but then through trial an error, I worked out that if you turn the mac firewall ON, in the tab under firewall, then go back to the General tab, the Allow button should now appear... 
 Shame Sohpos didn't make this clear...

Nicholas White · Answer

I was getting the popup repeatedly too. 
 When I get sent to Security and Privacy it's on the RHS Privacy tab. No Allow button. 
 When I click on the LHS General Tab there is an Allow button and something about allowing Sophos downloads from a non-Apple site. I forget exactly what it said. 
 I clicked on the Allow button for downloading Sophos from non-Apple site and so far the popup seems to have disappeared. 
 Mojave 10.14.6

A B12 · Answer

OMG I figured this out accidentally, by installing AVG software. What the Sophos instructions ( https://community.sophos.com/kb/en-us/134552 ) fail to mention is that you need to add the Sophos app from the Applications folder to Full Disk Access as well. The Sophos popup fails to do this, and you have to do it manually. Then, indeed, in the General tab you are asked to Allow the app. 
 Hope this solves the issue. By the way, Sophos customer service is crap.