Not sure if i understand you.
How do i exchange the old GRC if i dont have old classic client up and running?
Are the "old" GRC and "research" GRC compatible or not?
The adresses are not compatible. Your coins have to be burned at the pool website to change them into research coins
First make sure you have both the latest classic and research version installed. Next gather all your classic coins in the wallet.
Follow the burn instructions and you will now have your research coins. These you cab start trading october 20th!
http://pool.gridcoin.us/CoinExchange.aspx