Ok this is a bit of a long winded approach but it does work. I promise!
I tried this earlier on today and it created an msi file that installed the MetOffice Weather Gadget. Came it at about 320kb. I say long-winded but I think from start to finish it only took about 20 minutes. And because the baseline is already done the next gadget will take only a couple of minutes.
Hope this helps.