A few days ago a client downloaded the 4.5 desktop software from the BlackBerry site for their AT&T BlackBerry Pearl 8100. Low and behold when they plugged in their device and it was upgraded from 4.3 to 4.5.0.37 (it has high 30's, I think 37). I don't have a 8100 so I neither confirm nor deny this will work. As always YMMV.

I believe they downloaded the multilingual without media manager.  

Image:Is BlackBerry 4.5 Device OS live? We think so.

As usual neither the author (Darren Duke) nor anyone I represent can be held responsible should you choose to try this yourself!
Darren Duke   |   August 13 2008 03:23:59 PM   |    blackberry  4.5    |  
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1 - Darren Duke    http://blog.darrenduke.net    08/14/2008 9:10:56 AM

Well, I downloaded it just to see and it DIDN'T seem to install any new device OS. Again, I don't have an 8100 so if you have one it may work.