Hi,
I'm the village idiot when it comes to computers...I only know what I need to know to get it to do the simplest things. But I did find an answer. It was a question posted by RBell1001 back on February 23, 2017 'How can I stop mechanic pop ups. There is a second reply from AppleJuice11 on November 26, 2017 and they explain what to do.....with screen shots. AND IT solved my problem.
Basically do these steps;
<Open Finder>
<Go>
<Go to Folder>
Type in <~/Library>
<Go>
<Application Support>
then if you find anything called Mac Mechanic or mmc move to trash and then empty your trash.
I also found a folder called mmhlpr and trashed it.
I hope it works for you.