Picture Manager is not included with Office 2013 and later versions, but you can install it as a standalone app.
Install Picture Manager
Download SharePoint Designer 2010.
In the ensuing message (at the bottom of your screen) that asks if you want to Run or Save the .exe file, click Run.
Accept the license terms and click Continue.
On the Choose the installation you want page, click Customize.
Expand Office Tools and select Microsoft Office Picture Manager.
Click the drop-down arrow next to Microsoft Office Picture Manager and click Run from my computer.
Click Install Now.
Edit pictures with the Photos app in Windows 10
Windows 10 has an app named Photos, a successor to Picture Manager that lets you edit photos. For information on how to open and use it, see Edit photos and videos.
Edit a photo you've inserted in an Office document
For information about editing a photo that you've inserted in an Office 2016 or Office 2013 document, see Editing photos without Picture Manager.