The last version of SAS Lattice C was 6.58, I complied a HD installation of this environment a few years back... It involved installing 6.50/6.51 then applying 4 more patches from physical floppies...
The archive has been circulating in various circles ever since then... lol and not in it's original archive form either which was lzx... I uploaded it to EAB Zone...
you can always identify my archive because I cut and paste the needed user startup assignments at the end of the READ.ME file in the root directory
There was an additional experimental ppc addon but my memory fails me in regards of what executables were actually ppc... I have the release but I wouldn't know where to look...