Appeals Committee. Disputed situations in tournaments.

You're right. The rules version has long needed revision. The HD mod has already become the default version for a long time. Tournament organizers write so themselves. Moreover, in HOTU (which is the default version for the tournament) it seems to be built-in, or at least it is downloaded already in that form.
Point:

The player using these programs and files bears all responsibility for any bugs arising from their use.

is not applicable, since the HD mod is the default version.

Right now there's a Blitz Jebus Cross going on, where almost every turn is finished in the last seconds. And I'm wondering — does AK really want to be flooded with complaints like "my computer lagged in time trouble, I think it's a bug from the HD mod, please allow me to replay the turn"? The question is rhetorical, you don't have to answer.

That's why I insist that players should first of all contact the tournament judges. And let them figure out whether it's a "bug" or "I think it's a bug".