How to download: on the game files right click-> Save Link As (or whatever is in your browser) and download all .js files. If not download that way then try with left mouse botton, it open a new page and loads into. Then go to File-> Save Page As and will save the file.
For easy download multiple files use FlashGet or something, just select all links on the page and drag it over download box
Then rename .js to .rar, then un-rar, then unzip and put the .pak file into Paks folder in your openbor.
For easy rename multiple files I use TotalCommander - select all files, press CTRL+M and type rar in Extension
Note: You must log in to view links
Personally i use DownThemAll!
add-on for Firefox and Double Commander
to download files (File -> Multi Rename Tool) .
Rhythm of Destruction Green Edition.part1.js Rhythm of Destruction Green Edition.part2.js Rhythm of Destruction Green Edition.part3.js Rhythm of Destruction Green Edition.part4.js