Ive been trying to download the indesign trail for days now and the first part loads but then theres an 'illegal seek error' and then
take forever extracting and doing nothing, i have got past this but then when i try to start it up the second loading part doesnt go past 45%
I would suggest run the cleaner tool : http://www.adobe.com/support/contact/cscleanertool.html?promoid=GYTAU
Make sure your user have read and write permission on the application and library folder of your hard drive.
Then try to redownload the software and install.
If it fails then run the disk permission from disk utility.
Another one you can try is to create a new admin account and downlaod and install the software on it.
Hope this helps.