That's an absolutely impossible assumption. I understand the OP was just trying to make a point but he chose a wrong example, or at the very least a very nonsensical wording. If any website or person ever claims that you have to download anything (or do anything in general) otherwise you lose your coins then they are either lying or retarded. Your coins are your coins and to keep them you don't have to do absolutely anything.

Now if any reader is that stupid that they would actually believe such a nonsense then they shall lose all their coins, they don't deserve to even use their computer. Stupid people are the worst danger to society, vast majority of all the suffering throughout the human history was caused by the human stupidity.