Fileinfo Extension Not Enabled on Local WAMP Stack
How would I enable the fileinfo extension?
I had to edit the php.ini file, which with some research I finally located in MAMP/conf/php7.2.1
Or whatever version of php you are using. It might be easier to find in WAMP.
All I had to do was add the line > extension=php_fileinfo.dll < then restart MAMP.
So open the php.ini file in notepad or whatever text editor you use and search for "extension=" and you will get to the list of extension=whatever.dlls. add this line > "extension=php_fileinfo.dll" ... After restarting MAMP and doing the concrete5 install test, I got the green checkmark for all.