The first time I download It was there but today when I try to making an icon like the tuts video in UI/UX design in Adobe Experience Design (XD) | Adobe Experience Design CC (Beta) tutorials , I wasn't there , I don't know if I turned up it or it just lost.
Ps : It definitely was there because I practice it before with making icons.
Boolean operations are not yet available in the UI of Adobe XD for Windows, but as an workaround you can use them via keyboard shortcuts. Here's the full list of keyboard shortcuts: https://helpx.adobe.com/experience-design/help/keyboard-shortcuts.html
You'll find them under "Keys for Path" section.
We will add the functionality in the UI as well in one of our upcoming releases.
To learn more about the available features in Adobe XD for Windows, please watch this tutorial: https://helpx.adobe.com/experience-design/how-to/adobe-xd-design-app-windows-10.html