Those whom had already updated were urged to migrate documents in their user directory, and those Windows 10 users whom hadn't to temporarily disable updates. Eventually, Microsoft suspended the update due to the reports of deleted files.
If you use Windows 10, and you're not sure if your computer installed the update, "To check if your system downloaded and installed the update, click the Windows / Start key and then type 'View Installed Update History.' Click that result and then check the last version that was installed. If it wasn't 1809, you should be safe."
Sources: ZDNet, Forbes, Microsoft.com