I found two articles about the RAM limitation with the installation. The first one is:
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Erroneous Install Error Indicating Not Enough RAM On Computers With Large Amounts Of RAM
ISSUE:
When installing FileMaker Pro 5.5 you get an error message that the computer does not have the required 8mb of RAM to install software. The computer has plenty of RAM for example; 2GB of RAM.
EXPLANATION:
This is a confirmed issue with the MindVision installer that FileMaker, Inc. utilizes to install our products. FileMaker, Inc. has confirmed this issue with the FileMaker products listed.
This document was published at a particular point in time. Product, services or technical information are subject to change without notice and may have changed since publication.
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And that's all. No diagnosis or work-around solution!! I left a message stating their explanation still didn't help to solve the problem. Wonder if I'll receive a reply?
There was an updater file but that won't help since it updates an installed FMPro 5.5.
I'll be heading to work later today. It should be quiet enough for me to take out two or three 512meg RAM chips to see if the install can take place. I'll report back later tonight.