Upgrade from CS3 Extended to CS4 (non-Extended) fails

Question

Hello everyone,
I looked at the upgrade method from CS3 Extended to CS4 it tells me I need to contact Adobe via phone and purchase the upgrade.  After receiving the upgrade, I attempt to install it and it informs me that it cannot find a valid Photoshop install and asks for version and serial number of my previous version.  It only give me the options of Photoshop CS, Photoshop CS2 (all the languages), and finally Photoshop CS3. No option for CS3 Extended.  So I give it CS3 and plug in the serial number and it says invalid serial number.
Called Technical support and spent 30 minutes waiting.  They had me do 'Ctrl+Shift+Double mouse click" to get a "Challenge Number" which does not work.  Then they said I had to call Customer support to get this Challenge number.  Called Customer Support and spent 1hr waiting...and still waiting.
So, can anyone help on how I can upgrade?  I'm guessing they were suppose to give me a serial number to upgrade.
I finally gave up with the phone support and filed a support case online...which said I should get a reply within 3-days.
Very disappointed with Support.  After paying over $1k in products, I would expect good customer support...but that's for another forum
Thanks.

Answer 1

Well, after getting so fed up, I finally figured it out.  But first I have to tell my story of frustration.
So, after calling Technical Support, their instructions to get the 'Challenge Number' by pressing Ctrl+Shift and double-clicking on one of the INSTALL screens did not work.  So, after a total of 44 minutes (most of it on hold), I was told to call Customer Service at 800-833-6687.  I called them and spent 55 minutes on hold.  When someone finally answered, I told them the story, and they told me to do the exact same thing, press Ctrl+Shift and double-click to get a Challenge Number.  I said, "Technical Support told me to call you guys to get my Challenge Number".  They said "we are Technical Support.  Please contact Customer Service at 800-833-6687 to get your Challenge Number".  I WAS ANGRY!
I than asked to speak to a manager. 10 minutes later, the guy came on and said that his manager was busy on another line!  He then promissed me that I should be able to get to "Customer Support" quickly this time.  After being very direct, stating that I do not want to spend another hour on hold, I asked him that there must be something else that they can do to fix this problem...nope.
So (sorry if you've read this far), I called the number AGAIN and was on hold for 40 minutes...then it turned 5:00PM Pacific Time!  ARG!
SO, THE ANSWER to the problem on getting a Challenge Number.  You must install the software on a trial basis FIRST.  (not during installation as Tech support tried to have me do.)  After installation, start CS4 for the first time, and it will come to Software Setup and ask if you wish to continue using it on a trial-basis, or if you have a serial number for the product.  Put in the serial number for CS4 and click Next.  The next window labled 'Upgrade Check' is where you press Ctrl+Shift and double-click to the the "Challenge Code".  Why Technical Support did not know to do this really bothers me.
Well, tomorrow, I will be contacting Technical Support at 6am to get this working.
And if it was a matter of pressing Ctrl+Shift and double-clicking, why was I required to purchase the software to be shipped?  I could have saved on shipping and tax if I just downloaded it the way I wanted to in the first place.
Well, thanks for reading.  Hopes this helps someone.