In the past we've allowed people to donate towards the continued development on a product. However, recent changes mean that a donation button is not allowed in the legal sense as we're not a non-profit organisation. The result is that our PayPal account was suspended.
Thus we will rephrase some of our documentation to avoid the word 'donation'. Our donationware software remains 'free' in the sense that people can try-before-they-buy for an indefinite period and then optionally buy/subscribe towards development for a price of their choice.
PayPal payments will be re-enabled very soon.