Does anyone know if Wolfram has a stated policy to provide all updates (major versions as well as sub-versions) to Mathematica for Home Use users with a yearly subscription? I was blindsided by their change of policy to start charging for sub-version updates as of version 10 and I want to understand their policy before deciding on further upgrades. Another question regarding updates is: Can one have two installations of Mathematica on the same machine, an older version with a perpetual license and a newer version with a yearly subscription license? If that is possible I could always quit the subscription at any time and still be left with an older, but still usable, Mathematica.