That is the previous build so not sure why it’s not letting you update.
If you run the Windows 10 Update Assistant which you can download from here, does it let you complete the update?
Do you know how much free disk space you have on your PC? If you use a netbook or similar some can have a small amount of storage and this can block updates, though the newer Windows 10 builds are supposed to reserve enough disk space to be able to update.