In the program listing it states "Converted from the Commodore 64 on June 23, 2004".
The was converted by Mark Musante on June 24, 2004 to TADS for Windows/DOS/Linux. This version was approved by Paul so is listed here as official.
Paul's website specifically provides downloads for the C64 & ZX Spectrum versions of the game; as well as downloads for André Baune's English & French ZX81 ports; so these have been added as official platforms.
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Nice little game, although it seemed like there were several objects which were not required for completion. Interestingly, the combat scenarios use random numbers - so on one try you might be successful on killing the goblin, but on another you might lose and it's game over.
Very short but enjoyable while it lasted (C64 version). I probably wouldn't have played if it wasn't for the rating and/or the comment so keep adding ratings / comments for games :)