Zaja,
I have tried it on 4.3 and I was unable to get it to function properly.
Although I had the code that was mentioned at
http://www.7dana.com/Must-Accept-terms-before-submitting-the-order/
my edits did not produce the desired results.
In the case of the "place order" stage of checkout, the statement as well as the checkbox shows up; however there is some code after it.
In the case of the "personal details page", every thing looks fine except there is no check box.
I have repeated the steps twice in hopes of finding something I missed, but I still get the same problems. (I made sure the code was unformated before changing the templates.)
Also, I have attached screenshots of both the problem areas. Thanks.