Error 0x800f080d says antivirus is stoping update.
Kindly refrain from creating duplicate post. You have been provided with resolution in below stated forum link.
https://community.bitdefender.com/en/discussion/92340/error-ox800f080d-says-my-anti-virus-is-blocking-my-windows-update-do-i-have-to-turn-off-bitdefender
Regards