Regarding using external storage to complete Windows updates

Using external storage to complete Windows feature updates is a standard, documented method and can be proposed to customers as a valid approach when internal disk space is insufficient.

The official guidance states that:

• When there is not enough free space to install an update, Windows will prompt that additional space is required and notify that an external storage device can be used so that less space is needed on the system drive.
• For PCs that do not have enough space to automatically install the update, Windows will prompt to free up disk space or use external storage to temporarily extend the storage on the PC. If external storage is used, Windows does not need as much free space on the system drive because it temporarily uses the external storage.
• This method is described as part of the normal options for completing Windows feature updates on devices with limited internal storage.

Therefore, treating the use of external storage for Windows Update as an official, standard option and communicating it to customers as an effective remediation for low‑disk‑space update failures is appropriate.

References:

• Free up space for Windows updates
• Free up drive space in Windows