Inplace upgrade is the only working solution so far for most of the cases. For me it was the only working solution too.
Yeah, looks like you are right! I left it until after Patch Tuesday to see if the February cumulative update would resolve it. It didn't, so I downloaded the latest ISO (which appears to include the January patches) and did an 'upgrade' to the same version (Datacentre with desktop). Seems to have worked, and after 'upgrade' it installed the Feb cumulative update with no issues.