TL;DR

This article is a more detailed tutorial comparing to this on reddit as it do not contain some of the important things to do before and after. This article will help you forcely enable Sets on Windows 10 Insider Preview(RS5) using mach2.

How-To

Download mach2 from its release. For 32 bit system, download x86, for 64 bit system, download x64. Extract the downloaded file, and open the folder where mach2.exe located. Open Powershell window using Administrator privileges under this folder.

Run .\mach2.exe display. you should see something like this:

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mach2 0.3 - Feature Control Multi-tool
Copyright (c) Rafael Rivera

This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it under certain conditions.

Enabled:
14184448 (variant: 63)
12805652
16669694
17057765
13849566 (variant: 1)
14184448 (variant: 63)
12805652
16669694
17057765

Disabled:

Defaulted:

It should not contain any value of 10727725 and 13849566 in Enabled section. If it has, please remove them first correspondingly using .\mach2.exe revert 10727725 or .\mach2.exe revert 13849566.

Then, run the following code and restart, then you can see Sets now:

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.\mach2.exe enable 13849566 -v 1
.\mach2.exe enable 10727725 -v 1

Fixing

Actually, you might found Sets disppearing after some times, and this is because the variant value for 13849566 is changed. By running .\mach2.exe display, you might find 13849566 (variant: 63) in Enabled section. If this happened, remove the entry 13849566 and readd it, then reboot.