On those same instructions and website, please try to download and install 5319275A.WhatsAppDesktop_2.2616.100.0_neutral_~_cv1g1gvanyjgm.msixbundle (280.25 MB)
If the issue still persists, please try performing an In-place Upgrade. Performing this can repair broken operating system files while your personal files, settings and installed applications will not be removed.
Few things to check on the PC
- Unplug all external peripherals except for the Mouse, Keyboard, and LAN cable before starting
- Disable or uninstall any third-party Antivirus program to prevent it from interfering with the upgrade