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ApplyUpdate is the 2nd-stage of the auto-update system, called after core has downloaded the update. As old versions of the Windows launcher EXE selects a 'client' JVM mode, heap memory could be limited to only 256MB. Until users upgrade via Windows installer, which replaces the EXE with 'server' JVM mode baked-in, then a work-around is to pass -XX:MaxRAMFraction=4 to the new JVM in order to emulate heap size in 'server' JVM mode.