Put only maps that you really need.
Also, iGO 8 do not recognize a lot of file types. Put only fbl and poi. And buildings.

When i finish downloading (limited speed from host) i will tell you what else you can remove

Edit:
There are already Andora, Gibraltar, Spain, Portugal files... (from 2014), in archive. Remove them all.
Remove voice (and lang) files that you don't use. Car bmp files...audio files.
Core player is not needed at all. There is also one mp3 song

After all of this, iGO8 folder will be around 32MB...you can add enough files.