Today I recieved a message advising me of a new core client ver 4.09 (from SETI server). My question is, will updating the core client screw up my experiment? I\'ve got a box almost through spin up and I\'m unwilling to trash this run. Will climate prediction continue to run on the 4.05 client?

I have migrated 4 clients to 4.09, and have not had any problems.

Do not uninstall, or detach. Merely stop BOINC and install over the top.
<a href="http://www.boinc.dk/index.php?page=user_statistics&amp;project=cpdn&amp;userid=13"><img border="0" height="80" src="http://13.cpdn.sig.boinc.dk?188"></a>

As some people have had problems in upgrading, it would be wise to save a copy of the BOINC directory as a backup. If you should have a difficulty you can then revert and try again. Personally, I was fine. :)

Regular backups are sensible anyway.