So I already knew there's tons of places you can get a Windows install ISO, and some website even post a checksum for verifying, but what if I don't trust any third party and want it directly from Microsoft, or at least a Microsoft certified website? Can I download the ISO file or view the checksum from a trusted place?
2 Answers
You can download Windows 7/8.1/10 images directly from Microsoft
As for checksum, see Microsoft Windows ISO checksums.
I also found an answer myself: https://msdn.microsoft.com/en-us/subscriptions/downloads/