Sorry that I can't help you but I have a similar problem. I'm taking the helm of our network monitoring from someone who had a licensed enterprise copy in 2006. I rename the old directories and install the new free too. The same error comes up.
I hope someone who might know the answer reads this and responds.
Hi everyone - I'm sorry this has taken so long to reply, but I've recently taken over as the PM of CatTools and had this question come up again. If you download a trial version of CatTools and decide not to buy a license, it will revert back to the free version in 30 days. If you have a licensed version, you can continue running it without renewing maintenance if you choose. I hope that helps,
I've just had the same problem
here's my solution
download regshot (to compare registry)
uninstall cattools run it first time (1st shot)
run it second time (2nd shot)
compare results - look under values modified section of generated txt file..
for me suffice was to delete reg keys :
(backup them before deletion...)
I tested it on virtual machine, the first entry differs for every machine/system (and contains some strange looking chars and values)