We have a 32bit version of updater v0.7.2 here: http://downloads.hologram.io/dash/updater/dashupdater-0.7.2-i686-mingw32-32bit.zip
We don’t usually build a 32bit version so that one is slightly out of date, but we’ll try to get 0.7.3 built soon and posted here. This one should work fine for you though. You can copy it over the path in that error message.