You're right, the file is there, but it's not showing up. The path is wrong somewhere.
Okay, make sure you are using the "flash" template as it is without any change from the ZIP file.
If that's so, go into your Admin CP, vBulletin Options, and make sure the forum directory is set to:
http://ensim.ionhosting.com/~admin71/forum
It should work then.
Worse comes to worse, go into your "flash" template, and replace $bburl with
http://ensim.ionhosting.com/~admin71/forum
- do this in BOTH places in the "flash" template. It will work.