https://filehippo.com/download_kindle_for_pc/history/
Pick one & DL to your PC. [TURN OFF in Tools Auto Up Date] When popup ask if you want up date click on Remind Later... Sign in & Download ebooks to your PC.
Open Calibre Click on left hand upper corner to get ebooks when the next screen come up go into Docs file & then click Kindle ebooks file when it opens ....at this point you can click on each in turn or click hold to highlight ALL Then in the bottom box click on OPEN At that point they will transfer into Calibre. Hope this was what you were looking for.