Use simplified Windows install command

Author: szarnyasg

_includes/installation.html

@@ -180,13 +180,9 @@ <h4>Docker Image (for WSL2)</h4>
 
 <h4>Installation Script (Alpha)</h4>
 
-You can now install DuckDB with a script from an administrative PowerShell terminal. Please note that this script is an alpha implementation and exercise cautioen when using it.
+You can now install DuckDB with a script the Run menu or the Command Prompt. Please note that this script is a beta implementation – exercise caution when using it.
 
 {%- highlight powershell -%}
-Set-ExecutionPolicy Bypass -Scope Process -Force
-[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072
-iex ((New-Object System.Net.WebClient).DownloadString('https://install.duckdb.org/install.ps1'))
-
 powershell -NoExit iex (iwr "https://install.duckdb.org/install.ps1").Content
 {%- endhighlight -%}