Please note that executing PowerShell scripts from external websites can be risky and may pose a security threat. You should always ensure that the source is trustworthy before running any code.

Here's an example PowerShell script that downloads a script from a specified website and executes it:
``` 
$url = "https://example.com/myscript.ps1"
$output = "C:\temp\output.txt"

# Download script from URL
Invoke-WebRequest $url -OutFile "C:\temp\myscript.ps1"

# Execute script
& "C:\temp\myscript.ps1" > $output
``` 
In this example, the script downloads a PowerShell script from the URL specified in the $url variable and saves it to the local file system in the C:\temp\ directory with the name myscript.ps1. The script is then executed using the call operator &, and the output is redirected to a file specified in the $output variable.

Please note that running scripts downloaded from the internet can be dangerous and should only be done with caution. Be sure to verify the source of the script before running it.
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