Does IC618 work in RHEL 8.2?

Hi,

I have checked the compatibility matrix document. I’m trying to understand when it says IC618 runs at RHEL 8, does it mean it works with the minor releases of RHEL for example 8.2? 

Second thing is, where should I look for IC617 (in fact old versions of any tools)? In the downloads I only can see IC618. 

Third, if I install the base then on top of it, installation just the hotfix is fine or I have to install updates also? Does installation of hotfix work?

Thanks for your time!