I’d first check whether the PDF password is tied to your PMI account password or generated when the book is downloaded. Changing your Google-linked password may not automatically update files you already downloaded, so I’d test one before downloading everything again. If you mainly need to work with PDF files, a tool like https://onlydoc.com/pdf-to-dxf PDF to DXF converter can also be useful when you need to turn PDF drawings into editable CAD files. For the PMI login itself, their support team should be able to confirm the safest way to switch from Google authentication.
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