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Upgrade Guide > Upgrade Instructions > C. Mount the new .iso to the VM drive
C. Mount the new .iso to the VM drive
Before mounting an ICE OS VM's .iso file, ensure the version number you are installing ends is a higher value than the version you are upgrading. ICE OS .iso files are numbered concurrently allowing easy verification. Just compare the last set of digits after the dash. (-5733, for example).
Important: Never mount an ICE OS .iso version with a lower value than the existing .iso.
To mount the ISO:
1. Right-click the VM and click Edit Settings.
2. In the Edit settings screen, perform the ONLINE INSTALL instructions. Additionally, If you are supporting Air-Gapping, then complete the AIR-GAPPING SUPPORT instructions.
*ONLINE INSTALL
A. In CD/DVD Drive 1 > CD/DVD Media: click Browse.
B. In the Datastore browser, select iceos-release-3.6.5-git-e61036a-6265. Also select Connect At Power On.
*AIR-GAPPING SUPPORT 
Complete the following only if you are supporting Air-Gapping.
A. Verify CD/DVD Drive 2 exists. If not, then add another CD/DVD Drive before continuing.
B. In CD/DVD Drive 2 > CD/DVD Media: click Browse.
From the Datastore browser, select release-iceos-airgap-release-3-6-5-44600.44601.iso
C. Also select Connect At Power On.
Note: VMware may list the drives in reverse order, so check the drives' details. One drive is designated as 'master' and the other as 'slave'. The iceos-git ISO is for the 'master' drive and the airgap ISO is for the 'slave' drive.
3. When complete, click Save.
4. From the Ready to complete screen, click Finish.
5. GEOREDUNDANCY:
For georedundancy perform the steps above for both the DC1 and DC2 VMs.