[JSWolf]

Originally Posted by Chrixm

My solution to the recent forced update from Amazon and you start receiving azw files that can not be converted.

My machine Windows 8 frozen nothing else installed Kindle 1.17.1.

Today I turned on that pc and I downloaded a book, after that I updated Calibre and DRMTools to 7.0.3 and the rest of plugins Obok, KFX input.
After adding the book to calibre and trying to convert to epub I wasn't able to do it.

I started researching here I found my solution.

1 Uninstall all related to Kindle.
2 Clear all the %temp% All
3 Open the windows register
4 Search all the register keys by using the search tool, look for Amazon
5 Delete all of them all the registers related to Amazon
6 Delete My Kindle content folder
7 Restart the PC
8 Install the most recent version of Calibre today 5.8.1
9 Install the most recent version of DRM tools 7.0.3, Obok, KFX input
10 Disconnect from internet
11 Install KPC 1.17.44170.exe
12 Run this command using cmd
ren %localappdata%\Amazon\Kindle\application\renderer-test.exe renderer-test.xxx
13 Start the KPC
14 Connect to internet
15 Login into kindle
16 Start Downloading your books
17 Move your books to Calibre
18 Your books are now in format azw3 according to Calibre

Hope helps you.

Why go through all that hassle? It's a two step process.

1. Reinstall KindleForPC 1.17 on top of the version forced upon you.
2. Run this command using cmd ren %localappdata%\Amazon\Kindle\application\renderer-test.exe renderer-test.xxx

DONE!