This might be helpful to some. Rather than constantly trying to update plugins etc., the manual approach of screenshots and OCRs is a little slower but is bullet-proof.
Download the open-source 'LightScreen'. In the options set a directory to where all screenshots will be saved. Set it to capture the full screen with the hot key of your choice (e.g. Prnt).
Open Kindle, set it to full-screen mode. Select a smallish font size. Turn off highlighting as this messes with the OCR. Start at page 1. Press one of the arrow keys to go to the next page. Press Prnt to capture. Press the arrow key again for the next page. Press Prnt. This can be done at a rate of about 1 page a second until the whole book has been captured.
After a few minutes you'll have a folder full of screenshots, each numbered consecutively. In Windows 10 select all the screenshots, then right click 'Print' and then 'Print to PDF'. All the screenshots are combined into one PDF.
The resulting PDF can then be opened in the opensource 'FreeOCR' and converted into text.
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