This is an unnecessarily complex way to convert your Google Play book to a Kindle readable version. Why don’t they make their systems interoperable? (Sigh!)
Go to Google Play Books:
Step 1: Click ‘My Books’
Step 2: Hover over the book you’ve bought in Google Play and click the ︙ button.
Step 3: Select download ePub and download it to your computer.
Step 4: Install Adobe Digital Editions (yes, you really have to do this).
Step 5: Once you’ve setup an account, go to ‘File’ and ‘Add to Library’, then select the file you just downloaded and open it.
Step 6: Go back to Library
Step 7: Download Calibre (yes, you also really have to do this.)
Step 8: Download DeDRM Tools (shhh… just do it) and extract files.
Step 9: On the main screen of Calibre, go to Preferences, and then click Plugins, under the Advanced Tab.
Step 10: Click ‘Load Plugin from File’ and select the DeDRM Tools file you just downloaded and extracted.
Step 11: Restart Calibre and Click ‘Add Books’, and select the downloaded file from My Digital Editions
Step 12: Select ‘Convert Books’, and select MOBI as the output file type.
Step 13: On the right of the Calibre app there should be a Path: Click to open link. This will lead you to your newly created MOBI file, which you can transfer to your Kindle.
Step 14: You’ll generally have an email that you can send files to, or you can just do it the old fashioned way via USB.