The download is in the UI4 section of the page and it sounds like you already downloaded it. Called trunk-25.zip here:
http://code.mios.com/trac/mios_ge-concord/changeset/25/trunk?old_path=%2F&format=zipIf you have that downloaded, you need to extract all (unzip) the files.
Unzipping the files should give you 8 files:
D_Concord.json
D_Concord.xml
D_ConcordPartition.xml
D_ConcordPartion.json
I_Concord.xml
J_Concord.js
S_Concord.xml
If you want the fix for renaming sensors than you need to download and rename the fixed up J_Concord.js file as listed in my post here:
http://forum.micasaverde.com/index.php/topic,12000.msg318391.html#msg318391 (make sure to rename the file to J_Concord.js after downloading replacing the one from the zip file).
Then you need to upload the files on the Vera go to Apps->Develop Apps->Luup Files to do that (make sure to leave Restart Luup after upload checked when uploading the files)
If you haven't already go to Apps->Develop apps->Serial Port configuration
set the Baud to 9600;
set the Data bits to 8;
set the Parity to Odd;
set the Stop bits to 1;
leave the other parameters as they are
Then to create the device go to Apps->Develop apps->Create device
in the Description field enter a name for your device
in the UpnpDevFilename field enter D_Concord.xml;
Leave all other fields blank
click Create device
You should end up with two devices created one the Panel and one for the Keypad
You may at that point need to go back into Apps->Develop apps->Serial Port Configuration and change "Used by device" to the Panel device for your Concord 4 (not the keypad)