18+ One Star Reviews says it all.

This app used to be a good podcatcher but is utterly unusable in El Capitan. It crashes constantly, lists multiple versions of the same podcast and doesn’t download properly. All this for $8! I’ve emailed and tweeted them and only gotten lame responses in return. Clearly a product on its last legs. Don’t purchase and get burned. Look at Overcast or another podcatching option. Lame, lame, lame.

Tony Ricciardi about Downcast