MSU Direct Download & Silent Install (PowerShell)

Download a specific MSU from Microsoft Update Catalog, run pre-checks, install with wusa.exe /quiet /norestart, and return the installer’s exit code. Logs to C:\Windows\Temp\MSU_Install.log.

What it checks

Pending reboot → exits 101.
Free space on C: ≥ 5 GB (default) → exits 103.
Download success from the Catalog URL → exits 104 on failure.
Otherwise runs wusa and returns its native exit code (0 OK, 3010 reboot required).

Quick start

Edit the variables at the top of the script:
- $MSUUrl (direct Catalog URL)
- $MSUFile (e.g. windows10.0-kb5060531-x64.msu)
- Optional: $minFreeGB

Run as Administrator:

powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\Install-MSU.ps1

Exit codes

0 = Installed successfully
3010 = Installed, reboot required (from wusa)
101 = Pending reboot detected
103 = Not enough free space on C:
104 = Download failed
others = Native wusa.exe codes

Requirements

Windows 10/11 or Server, elevated PowerShell.
Outbound access to the Microsoft Update Catalog URL.
wusa.exe available (built-in).

Notes

The script deletes any existing MSU at the target path before downloading.

If proxy/TLS blocks WebClient, switch to Invoke-WebRequest and enforce TLS 1.2:

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Invoke-WebRequest -Uri $MSUUrl -OutFile $MSUPath -UseBasicParsing

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