Direct Links for Windows 10 (OS Build 17134.285 + 17134.320) Symbols in .BLOB file format (rename to dwmcore.pdb).
The exact names for the folders that need to be created are located in the center (copy + paste) of each corresponding OS Build.
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Again, make sure to unblock every file you download (via File Properties) before using any of them.
Or, alternatively, you can disable the security feature entirely if you wish. I use a frequently updated tool for Windows 10 called 'Winaero Tweaker' (available at www.winaero.com). It features a ton of VERY useful tweaks, and as far as I'm aware, it's freeware as well as free of bloatware.
For what it's worth, I swear on my life that I am NOT affiliated with the development of this software, nor the hosting website, nor anything else other than the fact that I use it myself. So I'm not trying to plug my own work, or anything of that nature.
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Back to the original topic at hand:
Windows 10 (OS Build 17134.285) -- 7E2FFBA889DA4A0EEEC178DF672CE1B81 -- http://msdl.microsoft.com/download/symbols/dwmcore.pdb/7E2FFBA889DA4A0EEEC178DF672CE1B81/dwmcore.pdb
Windows 10 (OS Build 17134.320) -- 599E1538C2CCF8ECE275EE95CC1EE9C31 -- http://msdl.microsoft.com/download/symbols/dwmcore.pdb/599E1538C2CCF8ECE275EE95CC1EE9C31/dwmcore.pdb