Just for the record, direct links from Garmin (even obsolete, due new map released)
317.98 contains Thailand Image 2013.20 (Thai) and JCV
336.17 MB contains Thailand Image 2013.20 (Thai) and JCV
198.52 MB contains Thailand Image 2013.20 (Thai)
473.82 MB contains Thailand Image 2013.20 (Thai) and JCV Thai and English (?)
626.75 MB contains Thailand Image 2013.20 (Dual), 3D, SID, SQLite and JCV (the folder name is called "nuviTwn") :)))
408.57 MB contains Thailand Image 2013.20 (Dual), SID, SQLite and JCV
I think I am done, and I was right about the direct links