You should have a wallet with BTC from before 1st of August.
You should have BTC in Electrum wallet (Wallet A).
After 1st August
Install another Electrum Wallet (Wallet B).
Move all BTC from Wallet A to Wallet B. Wallet A should be empty of BTC, but there should be hidden BCC inside it.
Export private key seed of Wallet A
Install any BCC wallet (Wallet C).
Import private key seed of Wallet A into Wallet C. Wallet C should now have BCC amount equivalent to BTC in Wallet B.
From now on, use Wallet B and Wallet C independently.