This small guide explains you how to install OTA files which were downloaded to your computer

First of all you need to make sure you extract all files to a folder in case the files would be in ZIP format.
Then you can just copy the whole folder to the device memory or to a media card.
Now you can use the blackberry to activate the OTA files on your device.

Open the Media application on the blackberry
Press the left button next to the trackball
Click explore
Track down to Device Memory
Press the left button next to the trackball
Click Open
Track down to your /Games Folder
Press the right button next to the trackball
Click Open
Select the JAD file
Select "Download"
The Application will load on to your Blackberry and is now available in your application menu.