To recover your bitcoin cash, you need the access to the private keys of the wallet where your bitcoins were before the fork, which happened at the beginning of August 2017.
If you have withdrawn your bitcoins from your Multibit wallet in October 2017, then you can recover bitcoin cash from your Multibit wallet only. If you have no access to your Multibit wallet anymore, then your bitcoin cash coins are lost. I am sorry.
In case you still have access to your MB seed, I would recommend you the following simple steps:
Follow this video tutorial to import your MB HD seed into Electrum. Check if there are still any bitcoins on that wallet and withdraw them to another bitcoin wallet. Just to be sure that you won't lose them during the further process. This will not affect your BCH
Follow the official Electrum Recommendation on how to redeem Bitcoin Cash. Short version below:
2.1 Install Electron Cash.
2.2 Import your MB seed into Electron Cash.
2.3 Enjoy your coins and send your promised bitcoin cash reward to :) 3AxGUDoXKtz4w6fba6HPrp8j8XFmSwFCoE
Note1: For a more safer approach, read the recommendation.
Note2: In case you will not be able to import your MB HD seed into Electron Cash, first export another seed or private key from your Electrum wallet, which you created in step 1 and use it instead of the MB HD seed.