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You can download the whole book (legally) from here [pdf]: https://hastie.su.domains/ISLP/ISLP_website.pdf

That is out of date. The link you put is literally in OP's link but 2nd edition.

I'm not certain, but looking at that site it appears that the 2nd edition is the R version, whereas there is only one edition of the Python version.

Hmm. right you are it seems