@dwarf74: are you using a WBFS file system or .wbfs files on a FAT32 file system?
WBFS manager is for a WBFS FS; no split is required....the split is only required for FAT32 FS as 4GB is the max file size in the FS....
for the download you describe: ...it downloaded the rar parts...you can use WinRAR to extract it into an .iso manually.... but the two most common apps do this automatically as part o the process....
1.) for WBFS FS: use WBFS Manager to move it to your WBFS drive (it extracts the iso, converts the game partition and installs it to the WBFS partition in one easy step)...
2.) for FAT32 FS: use Wii Game Manager to move it to you wbfs folder of your FAT32 drive (it extracts the iso and converts it to .wbfs or .wbfs/.wbf1 (depending on size: it splits the data after 4GB) and installs it to the drive in one easy step)....
personally, i use a FAT32 FS, but instead of Wii Game Manager, i use a small command line app called WBFS_file.exe...drag and drop my iso to that, it extracts it into a folder with the game name [ID6], then i manually move the folder to my FAT32 wbfs folder...
hopefully this clears everything up....