How do I find and download Win 10 version 1909?

[Old_hand]

Thanks to an uninvited 1904 version being downloaded and installed on my older pc and making some older programs display badly, I went to version 1903 [via your Online Help], in case 1909 didn't work. Now I want to get back to 1909; but my one attempt produced an iso that the pc [in its present state] couldn't mount.I keep searching online, but cannot find a link. Advice, please?

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