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Since Paizo has only provided the updates in a separate file, to make it easier for me and my players when we check the rules and know what's valid or not, I've annotated all the updates so far with the annotation and commentary tools that PDF format provide. You can download it in this link: Pathfinder 2e Playtest Rulebook Updated
The number of updates is already astronomical, and I think it will be very difficult to keep up with the pace with Paizo without help.
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EDIT (Sep 25 2018): New version of the Rulebook with the Update 1.3, release date 09/24/2018. Collaboration of u/chgiaimo.
EDIT (Oct 1 2018): New version (1.0.1 - 10/1/2018) of the Rulebook with the Update 1.3, release date 09/04/2018. The new version has shortcut links on each page reference in the book so that you can just click on the page and it will take you to the page that they reference. There are also links in the Table of Contents and the Index. Those where provided by u/zargert. I made shortcut links in the spells lists.
EDIT (Oct 5 2018): New version (1.0.2 - 10/2/2018) of the Rulebook with the Update 1.3, release date 09/04/2018. Now with shortcuts to the Treasure Table provided by u/zargert.
EDIT (Oct 10 2018): New version of the Rulebook with the Update 1.4, release date 08/10/2018 (version 1.0.0 - 10/8/2018)
EDIT (Oct 10 2018): New version of the Rulebook with the Update 1.4, release date 08/10/2018 (version 1.0.1 - 10/8/2018). Some minor corrections in the levels in the new ancestry feat notes.
EDIT (Oct 24 2018): New version of the Rulebook with the Update 1.5, release date 10/22/2018 (version 1.0.0 - 10/22/2018)
EDIT (Nov 7 2018): New version of the Rulebook with the Update 1.6, release date 11/06/2018 (version 1.0.0 - 11/07/2018)
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EDIT (Nov 7 2018): New version of the Rulebook with the Update 1.6, release date 11/06/2018 (version 1.0.1 - 11/07/2018). Just to include the update in Wild Shape (page 82). Thanks u/MidSolo for letting me know.
Pathfinder Rulebook Pdf Download
EDIT (Nov 8 2018): New version of the Rulebook with the Update 1.6, release date 11/06/2018 (version 1.0.2 - 11/08/2018). To correct the note in the Acid Arrow spell, which was erroneously put into the Acid Splash spell. Thanks for the tip, /u/Seud.