[ Mark]MarkAnonymous 10 Jul 2012 13:17
i've just solved it. 'right' click on the icon in the system preferences for MediaLink. click remove from display. re-download the program RELEVANT to the system you are running! then it'll install and you'll be able to use it again.
HOWEVER
you will NOT be able to update the software past your system itself. eg) 10.5.8 will only run 10.5….