SSMS is ALWAYS part of any non-express version, including the DEV release (I mean, you don’t have to download it separately).
When installing SQL Server Dev. (or any other non-express version), during the installation process you will come across a screen on which you can select the components to install (for example, SSIS, SSRS, SSAS, BIDS, BOL, etc.). At this point, you will need to select SSMS to install it.
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