Note that an RBZ archive is actually a renamed ZIP file containing the Ruby RB/RBS files and other ‘helper’ files used by that toolset, these are almost always inside a subfolder… RBZ suffix, and it is not messed-up by the download processing, then the Install tool will read it and install it properly, irrespective of the file-type reported in the Finder … Set you Safari options to NOT mess with downloaded file-types, or to try and extract the contents of any compressed format file.
Or are you saying that if arrives as “SketchUp-stl-2.1.4.txt” ?
Is there a file downloaded which is named “SketchUp-stl-2.1.4.rbz” ?
