Elements 10 dmg file does not install on lion

Question

I bought Elements 10 as a download for Mac Lion 10.7.2 and it doesn't install properly. I started the install as admininstrator, via Akamai downloader, provided the serial number then it spent four hours 'checking the system'. I rebooted to terminate the 'hung' install application and now double clicking the dmg file simply lists the contents.
I already have LR3, saw no discusssions suggesting issues with Elements 10 so I expected that Elements would work easily, which is why I bought rather than trialed Elements 10. I have since downloaded the trial version just in case it was different but it's the same.
Mac Mini Mac OS X Server 10.7.2 (11C74)

Answer 1

Log in as a user with administrator access privileges - made no difference
Install the latest version of the Adobe software - all was up to date so made no difference
Install current Mac OS X updates - nothing to update
Re-create the preferences files - made no difference (with 'shift' restart between)
Ensure that your OS language setting matches the language version of your Adobe product - was IE, now US - no difference (with 'shift' restart between)
Run the application while no other applications are running - normal way so no difference
Run the Adobe application with the Login Items disabled - install hung (just like it did the first time I ran it and as reported by Reijo T)
Install the Adobe application from the desktop - standard procedure for all recent attempts & made no difference
Install or run the Adobe application from within a new user account - different behaviours noted but ultimately made no difference - if user is admin, then install hangs at 0% after requesting admin PWD - if standard user, install fails with same exit code 24 right after getting an admin UID/PWD - if repeated without log-off, install cannot start because process already running.
Update the video card driver - nothing to update
Verify that you are using the latest driver and PPD file for the printer - n/a
Remove third-party plug-ins - none for LR3, only other Adobe app.
Disable extensions using Extensions Manager - n/a
Reinstall the Adobe application - no effect
Repair disk permissions by running Disk Utility - lots of minor corrections but made no difference
Repair and defragment hard disks - OS X handles this
Optimize scratch disks - already optimized
Scan for viruses - not doing this
Set up a default printer in the Print Center - n/a
Troubleshoot fonts - n/a
Troubleshoot ICC profiles - n/a
My deadline for this project has passed and unless there's a quick guaranteed fix, I'm going back to Win7.