fix: Uninstall previous cli version windows

scripts/install.ps1

@@ -1,19 +1,74 @@
 $p = New-Object System.Security.Principal.WindowsPrincipal([System.Security.Principal.WindowsIdentity]::GetCurrent())
+
 if (!$p.IsInRole([System.Security.Principal.WindowsBuiltInRole]::Administrator)) {
     throw 'This script requires admin privileges to run and the current Windows PowerShell session is not running as Administrator. Start Windows PowerShell by using the Run as Administrator option, and then try running the script again.'
 }
+
 [Net.ServicePointManager]::SecurityProtocol = 'tls12, tls';
+
 $WebClient = New-Object System.Net.WebClient
+
 if ($env:HTTPS_PROXY) {
     $WebClient.Proxy = New-Object System.Net.WebProxy($env:HTTPS_PROXY, $true)
+
 }
+
 $version = $null
+
 try {
     $version = $WebClient.DownloadString("https://download.newrelic.com/install/newrelic-cli/currentVersion.txt").Trim();
     $WebClient.DownloadFile("https://download.newrelic.com/install/newrelic-cli/${version}/NewRelicCLIInstaller.msi", "$env:TEMP\NewRelicCLIInstaller.msi");
-}
-catch {
+} catch {
     Write-Output "`nCould not download the New Relic CLI installer.`n`nCheck your firewall settings. If you are using a proxy, make sure that you are able to access https://download.newrelic.com and that you have set the HTTPS_PROXY environment variable with your full proxy URL.`n"
     throw
 }
-msiexec.exe /qn /i $env:TEMP\NewRelicCLIInstaller.msi | Out-Null;
+
+try {
+  function Find-UninstallGuids {
+    param (
+      [Parameter(Mandatory)]
+      [string]$Match
+    )
+
+    $baseKeys = Get-ChildItem -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall `
+    | % { $_.Name.TrimStart("HKEY_LOCAL_MACHINE\") }
+
+    $wowKeys = Get-ChildItem -Path HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall `
+    | % { $_.Name.TrimStart("HKEY_LOCAL_MACHINE\") }
+
+    $allKeys = $baseKeys + $wowKeys
+
+    $uninstallIds = New-Object System.Collections.ArrayList
+    foreach ($key in $allKeys) {
+      $keyData = Get-Item -Path HKLM:\$key
+      $name = $keyData.GetValue("DisplayName")
+      if ($name -and $name -match $Match) {
+        $keyId = Split-Path $key -Leaf
+        $uninstallIds.Add($keyId) | Out-Null
+      }
+    }
+
+    if ($uninstallIds.Count -eq 0) {
+      return @()
+    }
+
+    return $uninstallIds
+  }
+
+  $uninstallIds = Find-UninstallGuids -Match "New Relic CLI"
+
+  foreach ($uninstallId in $uninstallIds) {
+    $arguments = "/x $uninstallId /qn"
+
+    try {
+      Start-Process msiexec.exe -ArgumentList $arguments
+    } catch {
+      throw $_.Exception
+    }
+  }
+} catch {
+  Write-Host -ForegroundColor Red "We detected you may be running an anti-virus software preventing our installation to continue. Please check your anti-virus software to allow Powershell execution while running this installation."
+  exit 1;
+}
+
+msiexec.exe /qn /i $env:TEMP\NewRelicCLIInstaller.msi | Out-Null;