It's permissible to create a copy for personal use, so long as you don't distribute the copy. Copyright is primarily about distribution of copies, not the making of copies themselves.
The reason making a single copy for personal use is generally considered permissible is because: (1) it may be fair use under 17 USC 107, (2) the copyright owner will probably never find out, and (3) even if the copyright owner found out it probably won’t sue over one copy.
https://www.gov.uk/government/news/quashing-of-private-copyi...