Having checked the specs it's only types 1 and 2 which have to be unique. Here are the types:
http://www.id3.org/id3v2.4.0-frames.txt wrote: Picture type: $00 Other
$01 32x32 pixels 'file icon' (PNG only)
$02 Other file icon
$03 Cover (front)
$04 Cover (back)
$05 Leaflet page
$06 Media (e.g. label side of CD)
$07 Lead artist/lead performer/soloist
$08 Artist/performer
$09 Conductor
$0A Band/Orchestra
$0B Composer
$0C Lyricist/text writer
$0D Recording Location
$0E During recording
$0F During performance
$10 Movie/video screen capture
$11 A bright coloured fish
$12 Illustration
$13 Band/artist logotype
$14 Publisher/Studio logotype
I'll add a counter so that it adds the first image found as type 3 and then the next as 4, etc.
@A_Disciple - if DiddeLeeDoo's suggestion of clearing out Scripts.ini and trying the installer again does not work, email me. I will create a debug version for you so that we can find out where this is failing.




