Premiere Pro CC2019 is causing an activation glitch where an already activated machine asks to be re-activated on launch, particularly if I launched PPCC2018 in the meantime. When looking at my profile it appears that CC2019 is adding an _64 to the end of the Windows computer name.

I can't t ell you why Adobe decided not to uninstall the older version of PPCC2018 but I assume the two versions can sit on the same machine.