Re: [ANN] (QTUM) - A Scalable PoS Smart Contract Platform - MainNet Complete!
I have a few QTUM in MEW, I know they're no longer an ERC20 token so I tried to send them to QTUM Core but once I put my address it says "Please enter a valid address.", why? I already used that address to receive some QTUM from Bittrex, so for sure works! 
Bittrex did the ERC20-->Qtum swap a while back. If your Qtum ERC20 tokens were on Bittrex, they were converted to Qtum mainnet tokens.
On MEW, there was no token swap. You still have ERC20 tokens. I'm not sure if it's still going, but Changelly was doing the swap still last I checked. You'll have to swap the ERC20 tokens to Qtum tokens before you can send them to Qtum Core Wallet.