Ok I got it to work...
Here is what I did. There are 4 versions of HTC Home on
www.pocketemu.com. I installed each one and then tested it. The last one I tried worked just fine. It is the one designed to work on WM5 and is only v1.5 but it seems to be working just fine.
Then I installed HTC Home Customizer and I was able to customize everything, including the custom weather.
I wish it was v2.1 but at least I got it working.
HTC Home is much better than Samsung Today 2