This is a bug in MacOS. When we upgrade the OS this is automatically fixed.
Explanation of why this happens. There are some restricted directories like /Library/StagedExtensions but on the Mac which has this insecure location issue this directory is not set as restricted and hence causing the issue while installing kext.
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I am also getting this issue. There is no allow button in system preferences.
@eskimo can you please help me out. (I know i am not right asking on someone else question but since i don't have any solution) I am stuck for a few days now. Here is a link to the forum https://developer.apple.com/forums/thread/667576