I had the same error messages and trouble installing the new "authorized" Swype on my Moto Droid. I uninstalled Swype, but then had to uninstall the installer apps from the first version. Started the download process from the link they emailed me, then installed the fresh update. Then had to make sure i reconfigured keyboard option--deselecting the android keyboard and checking the Swype choice, AND reconfigure the Swype prefs. Works absolutely perfectly, with a couple of improvements (like auto capitalization).
Very happy with the results.
Very happy with the results.