Latest stealth book - do I need to purchase again?

[RetroRedneck]

I purchased the stealth ebook quite a long time ago, and heard that it's been updated.

Do we have to purchase the book again? If not, how do I download the latest version?

Thanks.

[Play]

I also purchased the stealth guide a while back and have read it over the years, and to be honest, as long as you have the gist of it, that's all you need.

Nothing has significantly changed (I assume by your longevity being same as mine you bought it around the same time as myself).