in that link above, you'll see the MCPR tool link.
to make that easier, here it is;
https://download.mcafee.com/molbin/iss-loc/SupportTools/MCPR/MCPR.exe
click this new link and it'll download the removal tool for you.
go to your Downloads folder, double click the MCPR.exe file.
you'll see "Extracting Files, please wait".
then you need to click Next, Agree, Next, and then enter the Security Validation code (it's case sensitive) and hit Next.
it'll take about 5 minutes or more to go through all the installed McAfee products and remove them.
t the end of this process, McAfee should gone, reboot the PC and Defender will be enabled.