Connect the phone to your computer.
Go to: Options -> Advanced -> Media Card, press the menu key, choose "enable usb mass storage".
Note: Disregard that the screenshots are set to other options, they are just previos taken ones
At your computer you will get a Removable Disk at My computer, browse it.
Now copy the downloaded JAR / JAD files into the memory card.
Then disconnect the phone from the computer, at the phone press menu button and choose: Remove Media Card (at options, advaced, media card). Press menu again and choose "install Media card.
Now you need to browse to your DLed files at your phone.
Use media manager, browse to the JAR / JAD file, select it and you should get a install option.
Hope this helps you
