Yesterday, I downloaded Post-It, unzipped it and uploaded the folder (postit) through my FireFTP in Binary into the Template Directory.
I then went into the ACP, BACKUP MY DATA BASE and LOCKED THE SITE (I do learn from my mistakes).
Here is my panel in the ACP for Styles & Templates.

Here is a view of my Install Styles Screen:

As you can see, the Post-It Style is not listed.
Thanks,
Dave