I assume that you are asking on behalf of a charity or an educational establishment?
I also assume you are aware that the discount is for the CCleaner Cloud buisness version? ie for organisational use on multiple endpoints.
There is a special contact form on the CCleaner Cloud webpage:
Click on this:
I’ve given your question a bump-up to the notice of the CCleaner staff who visit the forum, but it may be Monday now before they read it.