Well, having spent the best part of half a day trying to find a problem with an Excel Add-in not working on a deployed machine (it worked just fine on the development machine), it wasn’t appearing in Excel. Not even an error message. Finally though, I’ve found the answer.
Having trolled around a load of websites, and learnt a load about install kits and how to install an add in into Office applications, I found an environment variable.
Set VSTO_SUPPRESSDISPLAYALERTS to 0
It then gave me an error message, saying it didn’t have an assembly. Easy to fix when I got the error message.
Hooray!
Dev Blog 
mind letting me know which web host you are using?
I’ve loaded your page in 2 different browsers and I will have to say this blog site loads a lot quicker then most. Can you suggest a good hosting company at a fair price? Thank you, I appreciate it! Plz also exc
Hi,
The blog is running on a hosted WordPress.com site.
I’m glad you’re getting a good experience from it.
Thanks