Good question and I don't know. ASIFRP is the only pdf version of a GR product I own. Doing some looking, I can see this - http://true20.com/files/true20errata.pdf
- being put out, but no mention of pdf updates. Perhaps a search on other forums?
To be honest, I like the setting, I like the rules, and I like Green Ronin products, so I was happy to support GR with a pdf purchase from their site (I used Amazon for the hardcover) even if I don't know if they release errata updates. If they ever do a 2nd printing, I think it's a no-brainer to allow a new download for past pdf purchases. Of course, a "revised" or "second edition" is a different beast.