There is no checkout on this page yet, and that is our doing rather than anything you did wrong.
FileDonkey is a one-person operation. Taking money properly means a payment provider, invoices, and tax handled correctly in every country a buyer might be sitting in. None of that is worth doing quickly, so preorders stay shut until it is done rather than opening on something half-finished.
That you got this far counts for more than it might seem. A free download tells us the software works. Someone reaching for their wallet before there is anything to buy tells us it is worth finishing.
When preorders open, everyone who backs the project early gets v1.0 free on the day it ships and keeps the launch price for good. Join the list below and you will hear the moment it happens — one email about it, not a drip campaign.
In the meantime the beta is free, and it is the whole application rather than a trimmed-down version of it.