Well I found the problem. I uploaded all the files into the includes area of my store instead of the: Admin/includes. I was thrown off because most add-ons have an admin folder showing in the folder structure.
I deleted files and uploaded into the correct area (admin folder) and it now shows. I suspected because I did not see an admin folder, but if the link location is: tools/image manager, there would have to be an admin folder upload in the admin. Then I read the instructions again and found that you do mention the admin folder in your instructions. 
This module is much needed. And you are right the ability to delete multiple images per page will be a huge timesaver. I am looking at 8 pages of unused images as of now, so I am looking forward to the update. Thank you so much!
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Where did you set the 600x600? In the IM-settings? This is not a setting to determine how large images will be displayed, but to what size they are reduced, by you, through the IM adim interface.
Under Configuration/Image Manager line one says: "Maximum large image width". Next line below is: "Maximum large image height". I had set both to 600.
On the right of Maximum image width where you edit I see this: "
Code:
Maximum large image width
Please make any necessary changes
Maximum large image width
The maximum sizes of the small and medium size images can be set through the admin interface (Configuration->Images).
You can set the maximum width of the large files here.
It came with a value of 800. I changed it to 600. So I assumed this meant 600 px would be the maximum image width displayed to visitors. Is this not the case?
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