From talking with some of the relevant folks, here is some further information for you.
A user who doesn’t have a Support Entitlement/Contract for ESXi will not be able to download the pre-bundled ESXi ISO with the iSCSI patch already included. However, the user would still be able download the free version of ESXi, and then later apply the patch through Update Manager or using the vSphere CLI.
There is a link to the patch in question listed in KB article 2007108. Under the resolution section click on the link "VMware ESXi 5.0, Patch Release ESXi500-201111001 (2008017)" and this will open up KB article 2008017. In that KB article you will then find instructions on how to download and apply the patch to the ESXi server. This is applicable to both users who are using the paid or free versions of ESXi.
We will be updating KB article 2007108 to reflect this information.
Hope that helps!