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If you’re trying to de-DRM Amazon’s newer.Using this example the file you want is C:\Users\Me\Downloads\DeDRM_tools_6.6.1.zip\DeDRM_calibre_plugin\DeDRM_plugin.zip. zip file you downloaded and drill down a couple of levels. It does not contain a top-level _init_.py file`, you’re trying to load the full archive folder into Calibre. If Calibre gives you an error like `ERROR: Unhandled exception: InvalidPlugin:The plugin in C:\\Users\\Me\\Downloads\\DeDRM_tools_6.6.1.zip’ is invalid.
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Since I’m on a Mac, I could not get an older version of Kindle to work on Catalina, so I installed a virtualized Windows 8 and I was able to set up everything without a glitch. The solution is to use two plugins for Calibre as detailed in this excellent guide.
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Unfortunately, the Kindle format is not compatible with all other ebook reading devices, so you’ll run into trouble if you want to use a tool like Calibre to convert your purchased books into a format compatible with your reading device unless that device happens to be a Kindle, in which case you’re good. If you buy ebooks for Amazon’s Kindle, you’ll have realized that they come with copy protection called Digital Rights Management (DRM).
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