What are the proper steps to get this ePO upgraded to from 5.3.1 to 5.3.3. What needs installing and in what order etc, looked through one of the install guides but its not the clearest layout so was hoping someone had done it and had a quick reference i can look at.
Install order etc, if any other than a cumulative package
We will eventually be going further but firstly we need to get to 5.3.3
Not sure what you mean by what needs installed in what order. There is only one setup for the install. Any hotfixes after that aren't really necessary since you are going to upgrade it again.
Follow KB71825 completely and run the pre-installation auditor tool. Make sure you have good backups. If the PIA tool indicates that there are extensions that need upgrading, you will need to do that before any upgrade attempt.
I would also suggest to run IISCrypto on the epo and sql servers, set it to best practices, then reboot.
Be sure to also check kb51569, which is the supported environments kb for epo for the OS and SQL servers.
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