Thanks for checking in, Dylan.  I ended up successfully installing the package via CLI.  In case anybody else needs these instructions, here were my steps: All working properly now!
I've just updated vCenter from 6.5 to 6.7 U2.  I then attempted to update our Dell R730 ESX hosts from 6.5 to 6.7 U2 using the following package provided by Dell: Version: 6.7 U2 ,A01Last Updated Date: 21 Jun 2019File Name: VMware-VMvisor-Installer-6.7.0.update02-13644319.x86_64-DellEMC_Customized-A01.isoFile size: 316.13 MBDescription: This is DellEMC Customized Image of VMware ESXi 6.7 U2 DellEMC Version: A01, Build# 13644319 When I import the ISO, create a baseline, attach it to a host, then check compliance, I am warned that the baseline is incompatible.  Does anybody know why this might be the case?  I thought I've read in my travels that there are issues updating hosts with custom images via vCenter, but would appreciate confirmation if this is truly the case.  Thanks in advance!
Customized VMware ESXi 6.7 Update 1 image