This is a BT issue, not a MacOs or indeed Apple issue...
From MacAfee website "IMPORTANT: Real-Time Scanning, and the Firewall in your McAfee software will stop working if you upgrade to macOS Big Sur while still running McAfee security software version 4.9 or earlier. To remain protected, do not upgrade to Big Sur if your McAfee software is at version 4.9 or earlier."
Reading more, MacAfee have a version (22.214.171.124 released in Oct 2020) that works with MacOs11 its just that BT have not adopted it and pushed it out via Virus Protect.
Just upgraded my Mac to Big Sur and during the reload got a Net Protect message "click allow in the Security & Privacy window to let us load your software" but cant find an allow button to click ?
I have had exactly the same problem. Been on to BT and spoke to several different advisors who all claimed no knowledge except for the last one who looked at the issue. He told me that in order for BT to rectify the problem the Development Team would have to update the McAffee Anti Virus software to the one that is compatible with Big Sur. So there's nothing to be done until BT makes this update. I asked how the team should be informed of the issue but it seems we have to hope that one of them is monitoring this forum! I'm not in the least impressed!
If all who have the problem raise a complaint via MyBT, hopefully the penny will drop within BT sooner.
You will not "have to hope that one of them is monitoring this forum!"
The moderators of the forum have been informed about this thread and they will pass the information on to the relevant BT Team.
I have already passed this issue into BT (I used to work for them), it is clearly their issue not MacAfee or Apple.
There is a version of MacAfee that works, BT just have not yet pushed it out.
OK I've seen lots of information about removing and re-installing Net Protect Plus which I did and once re-installed it is still telling me to click 'allow' in the Security & Privacy. I've been through all the tabs and there is no allow button anywhere. If no one has any suggestions can I ask if anyone can direct me to the correct people within BT who are responsible for the product. Like most support pages BT' are useless at pointing you at anything other than FAQ's
I am having exactly the same issues here....thanks everyone for comments.
I have uninstalled McAfee from BT for now and will reinstall when the latest version is made available by BT.
I have had exactly the same problem with similar outcomes. BT passed the buck to McAfee but when calling their office in Swindon I hit a brick wall getting a garbled American accent telling me to call back later.
A message was sent by BT several weeks ago warning of this problem but after calling both them and McAfee they both claimed to have no knowledge of this.
If this can't be sorted out quickly I may resort to switching supplier when my contract ends.