Add local rustdesk.exe support and improve installation script

RustInstall.ps1

@@ -19,19 +19,27 @@ if (-Not ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdenti
     }
 }
 
-# Checks for the latest version of RustDesk
-$url = 'https://www.github.com//rustdesk/rustdesk/releases/latest'
-$request = [System.Net.WebRequest]::Create($url)
-$response = $request.GetResponse()
-$realTagUrl = $response.ResponseUri.OriginalString
-$RDLATEST = $realTagUrl.split('/')[-1].Trim('v')
-echo "RustDesk $RDLATEST is the latest version."
+# Проверка наличия rustdesk.exe в текущей папке
+$localRustDesk = Join-Path $PSScriptRoot "rustdesk.exe"
+$rustdeskExistsLocally = Test-Path $localRustDesk
+
+if (-not $rustdeskExistsLocally) {
+    # Checks for the latest version of RustDesk
+    $url = 'https://www.github.com//rustdesk/rustdesk/releases/latest'
+    $request = [System.Net.WebRequest]::Create($url)
+    $response = $request.GetResponse()
+    $realTagUrl = $response.ResponseUri.OriginalString
+    $RDLATEST = $realTagUrl.split('/')[-1].Trim('v')
+    echo "RustDesk $RDLATEST is the latest version."
+} else {
+    $RDLATEST = "local"  # Устанавливаем фиктивную версию для локального файла
+}
 
 # Checks the version of RustDesk installed.
-$rdver = ((Get-ItemProperty  "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\RustDesk\").Version)
+$rdver = ((Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\RustDesk\" -ErrorAction SilentlyContinue).Version)
 
 # Skips to inputting the configuration if the latest version of RustDesk is already installed.
-if ($rdver -eq "$RDLATEST") {
+if ($rdver -eq $RDLATEST -and -not $rustdeskExistsLocally) {
     echo "RustDesk $rdver is already installed."
     cd $env:ProgramFiles\RustDesk
     echo "Inputting configuration now."
@@ -94,9 +102,16 @@ if (!(Test-Path C:\ProgramData\RustDesk)) {
 }
 
 cd C:\ProgramData\RustDesk
-echo "Downloading RustDesk version $RDLATEST."
-powershell Invoke-WebRequest "https://github.com/rustdesk/rustdesk/releases/download/$RDLATEST/rustdesk-$RDLATEST-x86_64.exe" -Outfile "rustdesk.exe"
-echo "Installing RustDesk version $RDLATEST."
+
+if ($rustdeskExistsLocally) {
+    echo "Found local rustdesk.exe, using it for installation."
+    Copy-Item -Path $localRustDesk -Destination ".\rustdesk.exe" -Force
+} else {
+    echo "Downloading RustDesk version $RDLATEST."
+    powershell Invoke-WebRequest "https://github.com/rustdesk/rustdesk/releases/download/$RDLATEST/rustdesk-$RDLATEST-x86_64.exe" -Outfile "rustdesk.exe"
+}
+
+echo "Installing RustDesk."
 Start-Process .\rustdesk.exe --silent-install
 Start-Sleep -Seconds 10