Adobe Photoshop CS5.1 Trial Wont Install on my Mac (OSX Lion)

Question

Information about the problem:
I am trying to install a trial version of Adobe Photoshop CS5.1.
I have fully downloaded the trail via the Adobe Download Assistant. The file i now have is 'Photoshop_12_1_LS1.dmg'.
I can open the .dmg and go through the basic steps ready to install. I press install and wait for it to do its thing.
The install then freezes at any given point at any %. Sometimes the % will stay at a certain point and the time will increase with no progress. At one point i left the machine for the '8 minutes' it required and the time had increased to 60 minutes +.
I have noticed a trend with each time i have tried it (31 Times).
The installer always seems to freeze at the section when it is installing: Adobe Recommended Fonts or Adobe Required Fonts or sometimes Adobe Bridge CS5.5 or Adobe Extension Manager CS5.5.
Once the install is stuck, it locks up the whole system and i have no choice but to hold down the power button as the machine is unresponsive. I have tried the installation multiple times and still no luck.
In order to try and solve the problem myself, i have removed all custom fonts from the font book and what remains is the default fonts on the system. I have even tried installing the trial without all the extra extentions supplied before installing the trial and still the same problem occurs.
I am in need of this trial and i would appreciate any help i can get.
Thanks,
John
System Info:
MacBook Pro 17inch
4GB Memory
2.8 GHz Processor
Mac OS X 10.7.1

Answer 1

I have found a solution to this problem. Install the files in safe boot mode. Here is the how to guide:
Part One:
With past attempts or even previous versions of Adobe CS can be still lying around on your mac, in order to remove the bits and bobs needed in order for a clean install you need to download the 'CS5 Cleaner Tool' by Adobe. This can remove all previous version of CS right back to CS3. This could be the problem effecting you download. This tool can be download from here: http://kb2.adobe.com/cps/829/cpsid_82947.html
YOU MUST USE THIS TOOL BEFORE MOVING ON TO PART TWO.
Part Two:
To start up into Safe Mode (to Safe Boot), do this:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
(Source: Apple: http://support.apple.com/kb/ht1455)
Part Three:
Now that you have let your machine boot up in Safe Boot.
    1. Locate the .dmg installation file. This can take a while to load, but be patient.
    2. Click to open the .dmg.
    3. Carry on with the installation as you normally would.
    4. Sit back and enjoy until its 100%.
Once it has installed you can now restart your machine and boot up as normal. Log in and then it should be there in your applications to use.
I have spent nearly 2 days myself trying to figure this out, and finally i have found a solution. I hope this helps anyone who has come across this problem themselves.
Good Luck,
John