The Propeller Tool 1.05.8 installs fine. When some attempts are made to expand the folder tree, an "Access violation at address 004E3E88 in module 'Propeller.exe'. Read of address 00000005." occurs. This can be dismissed and the Propeller Tool mostly appears to work fine other than sometimes getting these access violations. The hex memory display does not work in that all the columns are compressed to the left of the subwindow involved. Serial/USB I/O doesn't appear to work at all so downloading to the Propeller would not work. There is a Python downloader posted in Parallax's Propeller forum that runs under MacOSX so compiled files can be saved from the Propeller Tool and downloaded separately.