To check the internet connection, perform a speed test and restart your router if necessary. Repairing or resetting the iCloud app can clear all saved cache data and sign-in details. Install the required version of C++ Redistributable if its packages get deleted or corrupted. Disable Windows Defender Firewall and any third-party antivirus software installed on your system as they can sometimes interfere with apps and their processes. If none of these suggestions work, consider reinstalling the iCloud for Windows app.
If you encounter issues installing iCloud for Windows, check if Windows Media Features are turned on your device. If not, you won’t be able to use iCloud for Windows. To upgrade to iCloud for Windows 14.1 failed, ensure that your system meets the minimum requirements, update the C++ Redistributable runtime files, and disable Windows Defender Firewall.