We removed it till the next Christmas as was announced at the release. If you didn't save a copy write us at intothewildnsfw@gmail.com from the email you used for the purchase, we'll send a copy to you.
6.59 is the early access price, it will go on sale in a month.
You said you would try to fix an issue with it not being able to be installed at the ssme time as the main game, so, was curious.
Kinda a let down that itch doesn't let you let people download seasonal content they bought normally while disabling future sales of it until the next time the season comes around…