Downloading this game is free, that means that you only have to scroll down this website and click on the download link for starting it, You wont be asked for registry or anything like that and you wont be asked to pay anything before the download.
The idea is to allow you to download the game, take a look to it, test it and decide if you like it or not before making any payment. Then if you liked the result or if you think that the work behind it worth to be rewarded you are free to come back to this site and make Penumbra a donation.
I'm only asking for 1.99€ for each copy of the book to those who want to pay for it, in the end I leaved the amount to be donated open so you can donate more or less than that amount if you feel that any other prize or donation is fair.
I have to say that I'll make sure that any donation of 10# or more is allowed to download the high quality version of the book (probably using something like dropbox for not consuming to much bandwidth of this website). The high quality version weights 320MBytes and includes exactly the same content than the low quality one. In my opinion it doesn't worth to make a 10€ donation just for getting that version of the book, is more a gift that I want to offer to that people that want to support in that way the game than a real “premium edition” or something like that.
The link for making a donation is almost everywhere in this website, just click on the right icon or in the link just below this lines, when you do, you will be redirected to a paypal site from which you can make the donation. Just type 1.99 or the amount you want to donate and follow the steeps (basically accept the payment and register into your paypal account).
If you don’t have a paypal account yet you want to help us you can do it with a bank transference or any other way you want, just contact me in this mail address firstname.lastname@example.org and we will arrange it.
Little more to add just download the book and enjoy it!.