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install-msu-web-download/readme.md

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+# 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
+1. Edit the variables at the top of the script:
+   - `$MSUUrl` (direct Catalog URL)
+   - `$MSUFile` (e.g. `windows10.0-kb5060531-x64.msu`)
+   - Optional: `$minFreeGB`
+2. Run as Administrator:
+   ```powershell
+   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:
+  ```powershell
+  [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+  Invoke-WebRequest -Uri $MSUUrl -OutFile $MSUPath -UseBasicParsing
+  ```
+