Fixed possible loop in the winget installed check, that can occure when winget is not installed

Author: basicx-StrgV

src/WGet.NET/Components/WinGet.cs

@@ -31,7 +31,7 @@ public class WinGet
 
         private ProcessManager _processManager;
         private string _wingetExePath;
-        private DateTime _wingetExeModificationData;
+        private DateTime _wingetExeModificationDate;
         private string _versionString;
         private Version _version;
 
@@ -72,7 +72,7 @@ public string VersionString
             get
             {
                 // Check if winget got modefied or removed while the application is running.
-                if (_wingetExeModificationData != GetLastModificationData())
+                if (_wingetExeModificationDate != GetLastModificationData())
                 {
                     // Re-query installation if a change was detected.
                     QueryInstallation();
@@ -93,7 +93,7 @@ public Version Version
             get
             {
                 // Check if winget got modefied or removed while the application is running.
-                if (_wingetExeModificationData != GetLastModificationData())
+                if (_wingetExeModificationDate != GetLastModificationData())
                 {
                     // Re-query installation if a change was detected.
                     QueryInstallation();
@@ -114,7 +114,7 @@ public WinGet()
             // Set inital values
             _processManager = new ProcessManager("winget");
             _wingetExePath = string.Empty;
-            _wingetExeModificationData = DateTime.MinValue;
+            _wingetExeModificationDate = DateTime.MinValue;
             _versionString = string.Empty;
             _version = new Version(0, 0);
 
@@ -846,7 +846,7 @@ private string CheckWinGetVersion()
         /// </returns>
         private string CheckInstallation()
         {
-            string? pathEnvVar = Environment.GetEnvironmentVariable("Path");
+            string? pathEnvVar = Environment.GetEnvironmentVariable("Path", EnvironmentVariableTarget.User);
             if (string.IsNullOrWhiteSpace(pathEnvVar))
             {
                 return string.Empty;
@@ -906,9 +906,17 @@ private bool QueryInstallation()
                 _processManager = new ProcessManager(_wingetExePath);
             }
 
-            _wingetExeModificationData = GetLastModificationData();
+            _wingetExeModificationDate = GetLastModificationData();
+
+            if (isInstalled)
+            {
+                _versionString = CheckWinGetVersion();
+            }
+            else
+            {
+                _versionString = string.Empty;
+            }
 
-            _versionString = CheckWinGetVersion();
             _version = VersionParser.Parse(_versionString);
 
             return isInstalled;