Seems to be some talk NOF will be offering a RWD version in the near future. I'll also expect the continuance of a no trial version policy, so is this an easy to understand refund policy?

The only thing currently available is if you click one of the purchase options, then 'return policy' to arrive at:

So it looks like a buyer has 14 days from date of purchase, but what does this mean? ....

(2) Premature expiration of the right of withdrawal

asknet AG is very eager, including in the case of digital content, for the customer to essentially have the possibility to return digital content if they are not satisfied and to withdraw from the contract. The legislator, however, provides that the right of withdrawal shall expire if the entrepreneur has started the execution of the contract, after

a) the consumer has expressly agreed that the entrepreneur begins the execution of the contract before the end of the withdrawal period, and

b) has confirmed his knowledge that he loses his right of withdrawal by his agreement regarding the start of execution of the contract.

To the Sales Dept. of NOF ... this may be a good read,
What Converts Better: Free Trial or Money Back Guarantee?