in view of recurring problems with installing and activating the spellcheckers (see http://tech.groups.yahoo.com/group/OmegaT/message/23999\) one should consider
o improving the documentation (I'll see what could be done without changing the status
o change the wording: maybe "fetch" or "add" instead of "install" would do the trick, Or maybe some hovering tooltip(s)?
o restructure: currently "install", next to the (empty of filled out) list box, is misleading
o add a help button, opening the specific page in the documentation
o search on the customers system for dics and affs - this goes probably too far, but otoh if the users already have LibreOffice for instance, why force them to go back to this source
This is just my knee-jerk reaction, comments invited. I can just say, I have gone through exactly the same problems, when doing it the first time.