Moderator Notice
The discussion here is getting close to explicit instructions. Please take any specific questions elsewhere
I see that Alf has just updated to 5.3, to fix a problem with the new edition of Kindle for Mac, and to fix a problem with using the Kindle plugin under Linux.
As for keeping up-to-date, as well as an RSS subscription to posts (not a lot of use, since new posts are few and far between) there's an RSS subscription for comments. Just ignore any that aren't from Apprentice Alf.