By request I'm adding a how-to install from memory card
Download to computer, connect phone to computer trough USB, copy the files to your phone (memory card).
Use phone browser (media -> menu key, choose explore). Browse to where you placed the JAR file, select it and open, It should show you the download dialogue. Press download and it should install it (it will not use data traffic).
Hope this helps the one of you that have issues, if not just post it