I will surely help you.
Unfortunately Nokia 920 is currently not supported to upgrade to Windows 10. The following Phones and devices can upgrade to Windows 10:
Lumia 1520, 930, 640, 640XL, 730, 735, 830, 532, 535, 540, 635 1GB, 636 1GB, 638 1GB, 430, 435, BLU Win HD w510u, BLU Win HD LTE x150q, MCJ Madosma Q501
You may refer the Microsoft article below for additional information:
Hope this information helps. Reply to the post with an updated status of the issue so that we can assist you further.