Reg.Key "iprintScaling" doesn't work

Hi,

I need print several documents and I use the "Print" option of Win Explorer to do it. But the size of some documents are A3 and I need print them fitted to A4.

I've tried to set to in Regedit (HKEY_CURRENT_USER\Software\Adobe\Acrobat Reader\DC\AVGeneral) the key "iprintScaling" to DWORD=2 and bprintExpandToFit to DWORD=0 (according to Adobe Reader DC. Predeterminar impresión "Tamaño real"​). But doesn't work. The option in Acrobat Reader is keep in as "Actual size".

Any ideas?

I use Windows 7 and Acrobat Reader DC 2019.010.20099

Thanks in advance.