Thank you for watching.
Hmm... Assuming you are trying all this on the RTM of Visual Studio 2008 and you are building at a file location where you have access rights, I'd guess you have a bad installation.
In fact, I suspect even without a ribbon you cannot F5 the VSTO project. I believe that the errors you are getting are related to ClickOnce which we are not
explicilty using in this video.
Either way, please post this to the
VSTO forums where you will get the proper assistance rather than my guesses and suspicions.
Good luck!