If you put the title to a search engine, you would find the official documentation on this topic: What's new or changed.
But if you're looking for steps how to upgrade to AX 7 (as the first sentence suggests), the title of your thread is wrong. You…
Bingo! The last step if verifying it in system requirements and indeed, "The Workflow Editor ClickOnce application requires a 64-bit compatible operating system".
Proof that you and me and Martin are here. Where's everyone else?
Your information about DIXF isn't correct. For example, the Employee entity is included in AX out of the box. There are also many other entities based on DirPartyTable, such as Customer.
I think you mean that the wizard for custom entities has some…
Here is the complete blog post: Summarized values in AX form.