I'm having this same problem and I'm not very tech savvy, but I can tell you that I'm using OS 5.0.0.337. If anyone can tell me how to get the themes to go into the "theme" location, please let me know! I don't understand the whole "bbsak" thing.
If you follow the instructions you need to copy the theme (alx) into the os... the theme is downloaded with the hybrid files and you go to my computer c drive program files , common files. rom files, the os etc...then load the os