To install TV Guide Dixie, open xbmc, go to:
- System => File Manager => Add Source => http://install.mashupxbmc.com
- Go to repository folder then install dixies repo or download from attachment below
- Go to: System => Addons => Install From zip
and install the zip you just downloaded.

FOR A FRESH INSTALL
Then in System => Addons => Get Addons
TV GuideDixie repo should show up and you can install TV Guide Dixie from there

TO UPDATE
Go to Get Addons and select the repo, bring up the context menu and select Check for Updates....
After a while the addon will update.

After you've installed, please read this post before you run TV Guide Dixie for the first time.
http://streamboxlive.wordpress.com/tv-guide-dixie/
About the Add-on:
TV Guide is compatible with pretty much any add-on that can add a live stream to favourites plus there are some built in ones that you can install (some need a subscription to the service the add-on provides) and these will show up in the Stream setup window of TV Guide Dixie.

Setting your preferences for the first time:
Once you've installed the add-on and before you run it for the first time you need to set some things up.

SOURCE WINDOW:
There are 3 sections:
1. Source - Pick either DIXIE for direct links to my stuff or XMLTV for your own xml file.

2. Dixie URL - Pick either Dixie for all channels or OffSide for just the OffSide Streams channels. If you want to switch between the 2 at any point just come back to here and change the setting.

3. Timezone - Enter your Timezone and include Daylight Saving if it applies in your country. Eg: London is currently in GMT +1.