I use iCloud to synchronize calender and contact between my iphones/ipads/ipods and my two Windows-PCs. Untill today it worked properly.
After windows10 upgrade on my windows7 pc I deinstalled and loaded icloud again. But the installation stopped with the error message: “There is a Problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your Support personnel or package vendor.”
I tried it several times and restartet my PC. But nothing helped so far.