Thank you for getting back to me - the pdfs do download, but the link still gives me the same errors as in my original post, this time reference number is "#97.d7da1002.1640856893.59f3faf5" (some NXP website pages take a very long time to load for me, but otherwise, my internet connection is fine)
By the way, the datasheets seem to be incomplete and refer to a Reference Manual, and provide a link to https://www.nxp.com/docs/en/reference-manual/IMXRT1170RM.pdf, but the website says the page is not found.
Do you know where is the Reference Manual currently available?