Copied this from crinrict's help blog. Hope it helps.
Cause
Seems people that have the base game installed through the DVD get this message when trying to install the download version of one of the expansion packs. Be aware that is not necessary. You can very well mix the DVD version with the Origin download version (you can’t mix the Steam version with the DVD version though)
Solution
To be able to install the download version without reinstalling despite that message, do not click on the Download button in Origin, click on the “i” (information) button. This will open another window that also has a download button. Click on that to install.
Copied this from crinrict's help blog. Hope it helps.
Cause
Seems people that have the base game installed through the DVD get this message when trying to install the download version of one of the expansion packs. Be aware that is not necessary. You can very well mix the DVD version with the Origin download version (you can’t mix the Steam version with the DVD version though)
Solution
To be able to install the download version without reinstalling despite that message, do not click on the Download button in Origin, click on the “i” (information) button. This will open another window that also has a download button. Click on that to install.
Yes, if you click on the "I" button you will be given another download link, one that works
Comments
Cause
Seems people that have the base game installed through the DVD get this message when trying to install the download version of one of the expansion packs. Be aware that is not necessary. You can very well mix the DVD version with the Origin download version (you can’t mix the Steam version with the DVD version though)
Solution
To be able to install the download version without reinstalling despite that message, do not click on the Download button in Origin, click on the “i” (information) button. This will open another window that also has a download button. Click on that to install.
I had the same problem
*edit spelling error*
Yes, if you click on the "I" button you will be given another download link, one that works