Downes slammed Andy Evans for 'misinforming and misrepresenting' the midfielder, triggering a rift at the club.
Wigan and Tottenham have been linked with £4million moves for Hunt and the speculation led to the player criticising boss Steve Coppell.
Hunt claimed he was being kept in the dark about his dream to play in the Premier League again.
Downes rapped: "Stephen Hunt's attitude has been unquestionable. He has given it all in training and games. But he has been getting poor advice. Last week he claimed Steve was not telling him certain things.
"His head is being filled with misinformation by people. The advice he has been getting has been p*** poor.
"There has been speculation about him but no firm offers or bids.
"Steve Coppell, myself and the club want the best for Hunty. I want him to be a Premier League player again, with us. If that can't happen then good luck to him trying elsewhere.
"But there are people only interested in agitating for a move. Agents are supposed to work for clients and want what is best for them. The boss would never hold anything back from him."