How do I get bitcoin cash from old muitbit wallet 0.5.18 it did have bitcoin in on the fork date
This question has been asked to many times already. Try considering the search bar or mr.google.
Anyways, you can buy if you didn't have btc back then before august 1. But if you had, then go and get a new wallet with zero balance. meaning, new wallet with new, private keys, new back up, and new address. Go for the latest version. Tranfer your btc and wait for all the confirmations to finish before claiming your bch using the old wallet private key. Which should be around 30 confirmations if you have a lot of btc, and 5 if you don't have that much.
Then claim.