I upgraded from ESXi 5.1 to 5.5 as, due to hardware limitations, I cannot go higher than ESXi 5.5.
Naturally, after the upgrade, I am prompted to provide a license key, and an ESXi 8 license is not accepted.
How can I get a license for this old version?
If you currently have ESXi 8 licenses and assuming you have proper SnS it is a multi-step downgrade of the license. Each downgrade "action" steps the version back by 1 major version (e.g 8 -> 7, 7 -> 6 and then 6 -> 5).
For reference see this KB article: https://kb.vmware.com/s/article/81665#Downgrade
I am afraid this only applies to subscriptions. I do not have any option to manage licenses on my free account.
I used to have a free license for v5.1. Once that the 60 day trial expires, I am not too sure what it going to happen...
I will be quite in limbo, I guess, as I won't be able to move back to v5.1 (it's been way too long since I've installed it) and I cannot get a key for ESXi 5.5.
If you have an existing license key for 5.1 then you should be OK. 5.5 does not require a new license.
You can see here for reference: Licensing ESXi 5.x and vCenter Server 5.x (2014295)
- The vSphere 5.5 does not need new license keys. The existing 5.0/ 5.1 licenses will work and enable all the features of the software once upgraded