I'm not sure when it happened, but Microchip have removed all the "lite" and "eval" C30 compiler versions from their legacy compiler downloads. The only remaining legacy downloads require a licence serial number. All those open/free source projects can no longer be compiled without access to the relevant compilers (some projects also depended on the specific version).
Anyway, if anyone needs one of these, I find I have v3.20b, v3.21, v3.22, v3.23, v3.23b, v3.24, v3.25, v3.30, v3.30b, v3.30c, v3.31.