How crucial is it to use up-to-date study manuals?

Of course it makes sense to use the newest edition but if my public library has a free copy that could save me some money.
Examples:
I have a study guide book for CompTIA Security+ that is the Fifth Edition from the year 2016. Is that going to be out of date information?
I have a study guide book for a Dummies guide to (ISC)2 CISSP Sixth Edition that was printed in 2018. Same thing, is this going to contain out-of-date information?
Thank you in advance if you can shed some light upon these questions!
Examples:
I have a study guide book for CompTIA Security+ that is the Fifth Edition from the year 2016. Is that going to be out of date information?
I have a study guide book for a Dummies guide to (ISC)2 CISSP Sixth Edition that was printed in 2018. Same thing, is this going to contain out-of-date information?
Thank you in advance if you can shed some light upon these questions!
Comments
If you intent to write the exam, I would find/buy the latest one. Why risk wasting 699$ on a failed exam because you wanted to save 40$ for the latest book. If you are really tie on money, consider asking your employer for some funding. Alternatively, for a very low price there is O'Reilly subscription that could help you too, finally some public library have some access to the O'Reilly Subscription, so it could be a good way to access the latest books/training video.
2022 goal(s): CRISC, maybe CGEIT or TOGAF
"You tried your best and you failed miserably. The lesson is, never try." - Homer Simpson
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Forum Admin at www.techexams.net
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LinkedIn: www.linkedin.com/in/jamesdmurray
Twitter: www.twitter.com/jdmurray
For GIAC Exams if you materials are older than 6 months, they are outdated.