title: PowerShell Invoke-WebRequest trouble with links
body: <p>I'm trying to create a script which will parse an URL for a specific exe download link and download it. I'm doing this because the download link changes frequently. Below the code:</p>
  
  <pre><code>[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
  $path = "https://www.broadcom.com/support/security-center/definitions/download/detail?gid=sep14"
  $definitionPath = (Invoke-WebRequest $path).Links |
  Where-Object{$_.InnerText -like "*core15sdsv5i64.exe" -and $_.InnerText -notlike "*.jdb"} | 
  Select-Object -ExpandProperty href
  $Output = "C:\temp\virus_definition.exe" 
  $start_time = Get-Date
  Invoke-WebRequest -Uri $definitionPath -OutFile $Output
  </code></pre>
  
  <p>I receive one error telling me that the argument "$definitionPath" is empty or null.
  Any ideas how can i fix that?</p>
  
  <p>Thanks.</p>