Hi Stefan,
Welcome to the MSDN forum and thank you for your feedback.
Refer to your description, your issue is about the Visual Studio Subscription. Since our forum is to discuss the VS IDE and we cannot help you check your subscription benefit or this download permission, you can go to Support>Get Support>Contact Us!
to get a better support, thank you for your understanding.
Meanwhile, after research I found we can download the Windows 10 Fall Creators Update from
here. You can directly update to the latest version of Windows 10 or use the media creation tool to create the installation media or choose other download options.
For more issues about upgrade the windows 10 or download the ISO file, you can also redirect to this forum: https://answers.microsoft.com/en-us/windows/forum/windows_10 to seek for a more professional support.
Best regards,
Sara
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