The PIA tool chrased also on my test environment Windows 2012 (non R2) and SQL express
I've had it on one out of three ePO servers I've tested. 2008 R2 and SQL 08R2 and the free SQL. Biggest problem is not being able to export the list of incompatible extensions for remediation on client workstations/servers before migration. I've got a long list of incompatibles on a couple of 5 year old servers, I'll need to make a check list for uninstall on clients before server removal.
I think I'll update to 5.1.4 when and if it is released, then do the 5.9 in a January 2018 timeframe. Anyone heard about more about the 5.1.4 release date?