Does anyone know if it's possible to import files created in older versions of grasshopper into version 0.5? The files in question where made about 1.5 years ago (i.e. well after the jump from explicit history to grasshopper).
Nope, there was a brief window of opportunity as I maintained both file formats for a few consecutive versions, but I've completely stripped the *.wrm (de)serialization code now.
Yes you probably could. Unfortunately I haven't kept the versions that allowed for both file formats. Perhaps someone here on the forum still has the installer in question...
"The next version of Grasshopper will no longer support the *.wrm file
format. If you still have wrm files you should convert them now into
either *.gh or *.ghx.
Support for this file format was intrinsic to many different
interfaces and classes and in the interest of simplicity I decided to
remove legacy IO code from the core plugin."