Upgrading PHP only is not easily doable in the Bitnami solutions. We build all the components from scratch so it will require good compilation knowledge and a big machine to run the commands.
The easiest way to migrate all your data to a new machine is by using the "All-In-One WP Migration" plugin. Could you please let us know the error you get so we can take a look at it in case it's a problem with our configuration?
Apart from migrating the data of the sites, you will also need to migrate the certificates and any custom configuration change you have to that new virtual machine.
Happy to help!
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