Chet and all,
the testing version, which can then be updated to the regular version:
https://www.tug.org/texlive/pretest.html.I've been trying to continue to include all TL updates in the TL24 (last year's) release. So if you already have TL24, it should suffice to update packages (tlmgr update --all for everything). Because of numerous changes in LaTeX, it's unlikely that current tex4ht will interoperate perfectly with older LaTeX. Pretty much have to get the latest everything. Best, Karl
