Hi, Patrick ...
Yes, I know and had tried that. Just tried again to install the nighty on my 32-bit ThinkPad, which produces this message:
"Enigmail 1.0.1 could not be installed because it is not compatible with Shredder 3.1a1pre."
I was able to install the Lightning nighty to this version, so that's some progress. It doesn't actually work, after all, but it does at least install.
Perhaps this version of Shredder is just a bridge too far at the moment?