the file is there, but still doesnt work, i search the dragon age wiki for this and it says i should unpack the file into the addins folder or something like that, i got the game last year, and i downloaded the dlc just yesterday
If you go into your Documents\Bioware\Dragon Age\Settings folder and find your offers.xml file, then right-click and select edit, you can see if the offers file is being seen by the game. There should be a really long section in multiple languages that starts with:
<OfferItem UID="DAO_PRC_OCP_2" Name="o_PRC_CP2_Shale" ExtendedModuleUID="Single Player" Priority="99" Presentation="8" Format="1" BioWare="1">
<Title DefaultText="The Stone Prisoner">
If that section is not in the offers.xml file, then even if it IS in the addins.xml file, the game will not load the add-on.
If the Stone Prisoner is the only add-on that is not working, then you can download the .dazip files from here:
Add-in file: http://lvlt.bioware.cdn.ea.com/bioware/u/p/eagames/bioware/dragonage/content/DAO_PRC_CP_2/DAO_PRC_CP_2_1.0.dazip
Rather than double-clicking on the dazip files directly, you could download both files, then manually start daupdater.exe, click on Select DAZIPs and navigate to the correct files (or drag and drop the files onto the daupdater window) then select BOTH files and click Install Selected. That -should- copy the file contents into the correct directories and update both the addins.xml file and the offers.xml file.
Alternatively, if you are having problems getting DAUpdater to install things properly, then as much as I hate to point people to third-party created tools, you may wish to search for a tool called DA Mod Manager. One of it's better features is that it will look at your add-ins and tell you what it sees, but it will also allow you to UNINSTALL individual add-ons, and then if you use it to install both of the .dazip files (the add-in AND the offer files) it will update the appropriate files in your settings so the game can see the content.
As long as the addins and offers folders are present in your Dragon Age folder AND the xml files are both listing the DLC, then it -should- be working as long as an authorized account has logged in to the servers and validated it.
