For me this won't worked, but the trouble shooting in Win 10 solved my problem that Win 10 doesn't load the pics in Fotostream:
-Trouble shooting in Win 10 Crator update
.incoming connection -> something else
search for your icloud .exe files and running the trouble shooting one after the other::
C:\Program Files (x86)\Common Files\Apple\Internet Services\icloudphotos.exe
C:\Program Files (x86)\Common Files\Apple\Internet Services\ApplePhotoStreams.exe
C:\Program Files (x86)\Common Files\Apple\Internet Services\iCloud.exe
C:\Program Files (x86)\Common Files\Apple\Internet Services\iCloudServices.exe
C:\Program Files (x86)\Common Files\Apple\Internet Services\iCloudWeb.exe
C:\Program Files (x86)\Common Files\Apple\Internet Services \ApplePhotoStreamsDownloader.exe
C:\Program Files (x86)\Common Files\Apple\Internet Services\ApplePhotoStreams.exe
reboot
ccheck