Actually, now you say it, the secondary installer did run in CC2014.1 (which is what I opened first to then decide that I didn't want to use CC2014.1 and wanted to revert to CC), however the installer didn't run in CC.
Should the secondary installer run in all versions of DW now? It never did previously in CS6.
Is there a way to force it to run in CC now, or should I just reinstall?