How can I programmatically create a new page in EPi 4.62?
There is no DataFactory.Instance.Save in 4.x SDK.
This link tells me how to do it in v5.
I think the approach is the same as in EPiServer CMS 5, but as you noticed there is no DataFactory.Instance in version 4. Instead you use Global.EPDataFactory.
Per GunsarfsEPiServer development team