I downloaded all Language Packs for Office 2013 from this MS online article: Language Accessory Pack for Office. I noticed, that the Language Pack file for Norwegian is considerably smaller in size than the other ones and looks like to be a setup file for the streamed version of Office.
Trying to install the Norwegian LP in Office 2013 Professional Plus MSI then leads to an error. The others work fine.
For getting the language pack file, open the website link above, select Office 2013 and the select Norwegian from the dropdown list. On the right side, you have then two links for downloading the language pack (32 and 64 Bit). I think, both links are retrieving a wrong file.