For Fantasy Grounds it is up to the developer to update.
They have been very good on the forums with taking in corrections to things that are errors, and updating the ruleset to work with the most recent version of the program. For an error in an existing rule book they have corrected those when submitted I think. I do not believe they have updated anything from errata for a rule book.
There is no mechanism to auto update when updated PDFs are released.
That said all the adventures can be updated by the user so those errata can be handled by either the developer who did that module or by the GM. Most of the data is GM manipulatable by making a copy. Not everything is in the rule books.
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