Here are the steps needed to upgrade the SlimServer that comes with LinuxMCE (0704) to a newer version of Squeezecenter.

Upgrade SlimServer

mv SlimServer SlimServer.lmce

Move the downloaded file to /usr/pluto/servers and unarchive it.
Make a soft link to the new directory. This step just makes upgrades or downgrades go a little faster.

ln -s squeezecenter-some-version SlimServer

Add a user slimserver and a group slimserver This is the default that Squeezecenter runs as
Change the ownership of squeezecenter's directory to that of slimserver.

chown -R slimserver:slimserver squeezecenter-some-version

At this point you should be able to restart the dcerouter. This should start the new version of squeezecenter

Configure Squeezecenter

Squeezecenter needs a little configuration before it will work with LMCE

In a web browser, goto http://dcerouter:9000 This should bring up the squeezecenter interface.
Click on settings in the lower right hand corner.
Select Plugins from the menu at the top
Select Command Line Interface (CLI)
Set the port to 7890
Click on Apply in the lower right hand corner
Restart the dcerouter from either the admin web site or the console

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