Allow me to copy / paste directly from Microsoft's support website:
Thank you for posting in the forum. I understand that you cannot get any app on your Nokia Lumia 630, you are getting this error code: 80860010.
Please check in settings > time + date if automatically settings are turn off. Also, make sure that you have right language and region on your phone, and then please restart it.
I would also try to use other connection (Wi-Fi or data connection).
If issue still persist, I would try to perform hard reset and set up it again with your Microsoft account, but do not forget to backup your data. More information you can find here: