According to GOG, the first will have version 1.63 available for download for the offline installers even after the release of 2.0. I have yet to see it appearing.

Also did I understand it wrong that owners of the "classic" Fahrenheit will automatically get the remastered version, yet that too has not appeared.

Am I missing something?

Version 2.0 is up already (see attachment), but there's some inconsistency with the naming (in relation to earlier versions):
https://www.gog.com/forum/general/strange_naming_of_the_updated_cp2077_files

And if you want to keep version 1.63, you're probably better off to archive it on your own (like I did) - though (as a non-Galaxy-user) I can't say, whether the client will keep the older version up for those who want to return to it eventually. Despite to a contrary message, the remastered version has not yet been added to the accounts (as far as I can tell):
https://www.gog.com/forum/general/3_masterpieces_from_quantic_dream_giveaway_900_bargains_join_the_celebration_of_our_15th_anniversary_9aa89/post44

Here's hope, that the remastered version will be added today, now that the weekend is over.

The Fahrenheit remastered was added to my account recently, so that is definitely fixed. Also, thank you GOG.

The version 2.0 is available for download as offline clients, that was never a problem with me.
I was informed that version 1.63 will also be available as legacy or something version, as the difference in system requirements kinda kill the game for many. For example my system is now below the min sys requirements, when it wasn't the case with 1.63.
I forgot we had the weekend, so perhaps this too will be fixed later today or this week. I already have a copy of the files, but I rather have the option to re download them if something goes wrong on my side, than not.

I just received a purchase receipt for Fahrenheit: Indigo Prophecy Remastered. It claims it cost me $10, but I can't see any evidence I was charged.

Is this related to this? Some kind of botched giveaway?

Me too! I panicked thinking I had been hacked but can't see I have been charged anywhere.

Exactly the same thing happened to me - so you're not alone at least. I thought my account was hacked, sounds like maybe it was just the dumbest way to do a giveaway ever? I sent a support ticket so we'll see that goes

Me too, but I assumed it was just the perfect way for this to be done. :)

God I love GOG.