You can search fot the latest verison of gb whatsapp on google. their are plenty of websites on the internet providing this third party app, but as another user said in reply you should not use this modified version. It is not safe to use the third party apps. it's not only a security risk, you may also get banned by whatsapp for using it.
Already have the latest version for GB Whatsapp 2021. You should also update to use.
I don't usually use whatsapp gb for a number of reasons. I chose whatsapp plus for my phone as it suits my needs
I dont know why people using a third party app instead of official whatsapp app? This is harmful for data privacy and security.
You can use 4 whatsapp accounts in one phone.