Well, I would suggest you to download and use McAfee pre-install tool. The said tool prepares your device for the installation and also lets you know what is needed for the uninterrupted installation.
2. Try to reinstall the software
Other than this, if you do not wish to download the tool, then you may give it another try by navigating to mcafee.com/activate. But, prior to that, make sure you remove the junk files and files from the
cache memory of your device.
3. Use a different browser
Sometimes, the root cause of the installation issue is the settings of the web browser you are trying to install from. In this scenario, you may try switching to another web browser.
4. Temporarily disable the firewall
If you have activated a firewall on your device and restricted certain programs to download, then you may turn off the firewall temporarily and try again later.
5 .Fix issue with the DNS
Last but not the least you may try changing the DND settings of your device as this may help you in getting rid of the issue. Sometimes, it is too slow and restricts the installation of the software.
Hence, if you wish to install McAfee security solution without any interruption, then you may consider following these workarounds so that you do not come across the same error again.