09-02-2019, 11:33 AM
OP: in addition to the reference Jerry shows, you might find it useful to read the thread for the UEFI build which starts here. Note that the UEFI build ISO is still only for Lite 4.2 but you should be able to apply updates and invoke the in-series upgrade procedure as documented on the 4.6 release page/notes - this has worked for me from 4.2->4.4->4.6 but I haven't tried a direct 4.2->4.6 update.