How to install the XAP on another device (e.g. for testing)

I have sent the generated XAP file to my friend for testing purposes but he gets the error:

“There is a problem with this company app” (or something like this).

What else needs to be done to the XAP?

Guess I found the answer here:

http://blogs.windows.com/buildingapps/2013/11/27/options-for-publishing-windows-phone-beta-apps-and-testing-in-app-purchase/

Guess I found the answer here:

http://blogs.windows.com/buildingapps/2013/11/27/options-for-publishing-windows-phone-beta-apps-and-testing-in-app-purchase/