As of v1.5.17 and v1.6.0-rc3 (on win10/64) it requires not only be installed by an admin - which is obvious/natural/normal, - it demands a user to belong to administrators group.
Also it seems to be incompatible with SRP (Software Restriction Policies) “Disallowed by default” settings like these:
Unrestricted - %HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRoot%
Unrestricted - %HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ProgramFilesDir%
Unrestricted - %HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ProgramFilesDir (x86)%
Unrestricted - %HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ProgramW6432Dir%
Dissalowed - %HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Print\Printers\DefaultSpoolDirectory%
Dissalowed - %HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRoot%Temp