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If you wanna test this Windows 10 insider preview 18950 build but doesn't have the iso files, relax ! because you can download 18950 iso both x86 bit and x64 bit using the below links.
Note : The links provided are from third party source which are freely available on Internet, so try at your own risk like running on Vmware instead of original PC.
Download Windows 10 build 18950 ISO image 32bit (x86)
Download Windows 10 build 18950 ISO image 64Bit (x64)
Youtube Video Link
Credits : To the file uploader and Microsoft.