…There might also be actual HDTV airings of the 2-part version.
I recorded an SDTV airing of the original 2-part version a few years ago from a UK channel where old video masters and OOP stuff frequently turn up (especially Warner content). Unfortunately the resolution is 544x576i - nowhere even close to NTSC 720x480, let alone 720/1080p.
There was also a VCD release at one point.
http://www.tuah.com/vcdcd/cgi-bin/vcd_info.cgi?id=1709
Pretty sure this website is dead though.
I’d like to see the 576i and VCD versions.