You just need to install the compiler so that ldmicro can use it
to build your hex file ; no need to program in C.
Download last ldmicro32 files (zip version 5.5, not 6.0) on my github:
Download HTC (Hitech) C compiler on the same page and then read HowTo-PIC18 file in zip archive to install.
Post here if you need more help.