It's called out pretty clearly in the description, but it should be version 4. The Boson questions are definitely closer to the exam, and the practice questions at the end of each chapter of the AIO are good as well.
https://www.amazon.com/dp/126045455X/ref=cm_sw_r_sms_apa_i_nsJTDb0J7S9G1
It's certainly worth a go. I'd read through a guide, such as this:
https://www.amazon.com/Certified-Ethical-Hacker-Guide-Fourth/dp/126045455X/ref=dp_ob_title_bk
Then email EC-Council and explain that you have been working in IT security for 3 years (ok, so you might need to exaggerate a bit here), and that you'd simply like to take the exam, as you feel you already know the information contained in their syllabus.
You might get a few back and forths, but if they are playing hardball, say that your manager has only given you enough in the training budget for one cert this year, and you've chosen the CEH exam, but can't get the funds for the whole course. I expect they'd rather you pend the money on taking their exam, than went elsewhere.
To be honest though, you're probably better off buying the book to study anyway, then taking the OSCP cert from OffSec
You want your CISSP and your CEH next.
Even if you don't have any intentions of going into the offensive half of cyber, those certifications are more than worth the time and money you'll spend to get them in terms of the doors they'll open to you.