fix: check execution policy + require Powershell version >=5

windows_install.ps1

-[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+#Requires -Version 5
+
+$old_erroractionpreference = $erroractionpreference
+$erroractionpreference = 'stop' # quit if anything goes wrong
+
+if (($PSVersionTable.PSVersion.Major) -lt 5) {
+    Write-Output "PowerShell 5 or later is required to run Datree."
+    Write-Output "Upgrade PowerShell: https://docs.microsoft.com/en-us/powershell/scripting/setup/installing-windows-powershell"
+    break
+}
+
+# show notification to change execution policy:
+$allowedExecutionPolicy = @('Unrestricted', 'RemoteSigned', 'ByPass')
+if ((Get-ExecutionPolicy).ToString() -notin $allowedExecutionPolicy) {
+    Write-Output "PowerShell requires an execution policy in [$($allowedExecutionPolicy -join ", ")] to run Datree."
+    Write-Output "For example, to set the execution policy to 'RemoteSigned' please run :"
+    Write-Output "'Set-ExecutionPolicy RemoteSigned -scope CurrentUser'"
+    break
+}
 
 $DOWNLOAD_URL = (Invoke-WebRequest -Uri 'https://api.github.com/repos/datreeio/datree/releases/latest' | select-string -Pattern 'https://github.com/datreeio/datree/releases/download/\d+\.\d+\.\d+/datree-cli_\d+\.\d+\.\d+_windows_x86_64.zip').Matches.Value
 $OUTPUT_BASENAME = "datree-latest"
@@ -21,7 +39,7 @@ Remove-Item $OUTPUT_BASENAME_WITH_POSTFIX
 
 $dotDatreePath = "$home/.datree"
 mkdir -Force $dotDatreePath | Out-Null
-$k8sDemoPath =  Join-Path "$dotDatreePath" "k8s-demo.yaml"
+$k8sDemoPath = Join-Path "$dotDatreePath" "k8s-demo.yaml"
 
 Invoke-WebRequest -Uri "https://get.datree.io/k8s-demo.yaml" -OutFile $k8sDemoPath