Your grant number entitles you to all the latest versions of any product you have entitlement to, including epo. 5.10 is the latest version, but for now, you will need to open a ticket, as the installers have been pulled while rebranding is in progress.
Rather than upgrade from a legacy version with legacy software that can bring old problems with it, I would highly suggest setting up a new epo server with the latest update, install all the latest extensions for the products you are using, export your system tree, policy and task assignments, any queries you want, etc. and then transfer systems to the new environments. Most of the extensions are backward compatible to lower versions of the product, within reason. For example, ens 10.6 version can't be managed by ens 10.7 extension, though you might want to verify that with the ens team. I could be wrong since I don't support that product.
The agent extension is backward compatible with all versions of the agent, so a 5.6 agent can be managed by 5.7.8 agent extension. It would be advisable, however, to upgrade your clients too eventually to the latest versions.
The latest version of epo and many of the point products have also updated url's needed, such as epo.mcafee.com to epo.trellix.com, as well as the different point product gti lookups.
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