maint(one-liner.ps1) improve compatibility with Invoke-WebRequest & better error handling

installer/one-liner.ps1

@@ -1,6 +1,27 @@
+# Define URL and dynamically extract filename from URL
 $url = "https://git.rimmyscorner.com/Rim/iw7-mod/releases/download/latest/iw7Installer.exe"
-$file = "iw7Installer.exe"
+$file = Split-Path -Path $url -Leaf
 
-(New-Object System.Net.WebClient).DownloadFile($url, $file)
-Start-Process -Wait $file -ArgumentList "-s"
-Remove-Item $file
+# Check if file already exists and delete if necessary
+if (Test-Path -Path $file) {
+    Write-Host "Removing existing file: $file"
+    Remove-Item -Path $file -Force
+}
+
+# Download the file using Invoke-WebRequest for better cross-platform compatibility
+try {
+    Invoke-WebRequest -Uri $url -OutFile $file -ErrorAction Stop
+} catch {
+    Write-Error "Download failed: $_"
+    exit 1
+}
+
+# Start the installer with arguments, wait for it to complete
+try {
+    Start-Process -FilePath $file -ArgumentList "-s" -Wait
+} catch {
+    Write-Error "Installation failed: $_"
+}
+
+# Clean up downloaded file
+Remove-Item -Path $file -Force