I can't believe no one has posted this. At least no one from what I can tell. There's a Kickstarter for a package of the complete series and it sounds like all the games will be coming to gog. There's 12 days left on it, so get to it if you want your own linking book.

https://www.kickstarter.com/projects/1252280491/myst-25th-anniversary-collection/description