I've got this album...

Ok, the first thing to check is that iTunes can play all the tracks for the album, if just one of the tracks has got lost the link wont work, by trying to play them in iTunes it will make iTunes aware of this and it will ask you to find any that are missing, this will update the library and the AlbumLink will work...

...but if not then you need to check the tags are correct, so try the script again and when it tells you it cant find any tracks press the 'Help' button and write down the info for artist and album exactly. Now go back to iTunes, find the album in the browser, select it and press 'Apple' + 'i', ok the note about editing multiple tracks, click the 'Tags' tab and compare the info in the artist and album fields with what you wrote down.
Note:
Albumlinks look for tracks with tags that contain the info you wrote down, so don't worry if there is extra info in there, like 'featuring so and so', just so long as what you copied from the Albumlink help dialog is in there. Pay attention to the punctuation that may be different, upper or lowercase letters don't matter.

All the Albumlinks use the Artist / Album tags from the online CD Database iTunes searches when you put in a new CD for the first time, unless this info is obviously wrong, in which case I use the CD box for the tags.