Importe o certificado usando o certutil:
certutil -importpfx [Path to certificate file]
Adicione a ligação HTTPS ao site com appcmd:
appcmd set site "Default Web Site" /+bindings.[protocol='https',bindingInformation='*:443:']
Adicione o certificado SSL ao endpoint com netsh:
netsh http add sslcert ipport=0.0.0.0:443 certhash=[thumbprint of certificate] appid={[random GUID]}