Hi mate I'm using MS Office Home and Student 2010 with Windows 10 version 1607 and my printer is a HP Laserjet P1006 with the full solution drivers not the basic drivers. I tried a Office repair and still not able to print single 6 3/4 size envelopes in MS Word although I can print only #10 envelopes okay. In Dec 2016 there was a big Win 10 update and can no longer print 6 3/4 envelopes now.
Did you try completely removing the printer (all instances) including all previously installed software packages / drivers, disconnect it and double check device manager and make sure it's gone.
Then reboot and try reinstalling the software and connecting the printer during the install when prompted??
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