FileZilla refused to give me a copy of the version I purchased for 'security reasons,' even though they were already updating the version installed on my system, so it makes little sense to deny me access to the app. It is also worth noting that in the first email I received from them, they had already offered me a discount coupon to buy a new version. I strongly believe the decision to withhold a copy of the software is driven by financial motives rather than security concerns.