When an Author Make Changes to an eBook on KDP, does it get Updated?

 

I asked my son that question and he said that it’s possible that the eBook updates on Kindle devices and the reader will have the updated version, however I searched for the answer and found this:

An eBook updates on KDP when an author uploads a new manuscript, but these changes generally only apply to new purchases. Existing customers who already bought the book keep their original, unedited version, as KDP does not automatically push updates to previously purchased Kindle devices. 

Anyone purchasing the book after the update goes live (usually within 24-48 hours) receives the latest version. Customers who already own the book do not get the update automatically.

Users can sometimes see "UPDATE AVAILABLE" on their "Manage Your Kindle" page if it is a major update, but this is not guaranteed for minor typos.

Technically, if a reader purchased the un-edited version and reviews the book as saying it had typos, another reader won't see the typos because they will have the updated version. 

It's unfortunate, but some authors, me included, occasionally spot typos and other errors in their eBook manuscripts that require immediate updates, no matter how minor. For instance, on my recent uploads, I discovered a couple of typos that prompted me to revise the file and re-upload it to KDP. I want to extend my apologies to those who downloaded the book before these corrections were made. My heart sinks when I come across errors, no matter how minor they may be. Nevertheless, it happens and all I can do is fix it. Indie authors understand what I mean.

Author's Website