This version was ported to the Commodore PET by David Malmberg and subsequently ported to the Commodore 64 (several versions) by one or more unknown authors. It has been extensively modified from the TRS-80 original with extra objects, slightly different puzzles and different scoring.
David Malmberg's verion was further expanded and ported to MSDOS by Tony Baechler. That versions seems to date from around 1987, going on other archive sites.
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This game was also ported to the Commodore Plus4. You can find it on Recall Collection disk #110, available in the Commodore C16 / C116 / Plus 4 TOSEC.
If you prefer, the Plus4World link: https://plus4world.powweb.com/software/African_Adventure