There are no instructions, since there's no need to do anything special.
Since inserting Coupons proved to be difficult for some users in past sales, we just lowered the prices temporarily. I understand this might remove a bit of the excitement from not seeing the full price slashed with the discount on its side but, in theory, should be much easier to use than having to type a Coupon manually.
KORD V2, for example, used to cost 34$
https://fselite.net/reviews/fsdreamteam-chicago-ohare-v2-the-fselite-review/Of course, that review for for version 1.0, so it's obsolete by now, since we remade all 4 seasons and fixed the visual glitches on stairs.
