Fix: Uninstall previous version

Author: BornToBeRoot

InnoSetup.iss

@@ -2,7 +2,7 @@
 ; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!
 
 #define MyAppName "NETworkManager"
-#define MyAppVersion "2023.1.8.0"
+#define MyAppVersion "2023.2.16.0"
 #define MyAppPublisher "BornToBeRoot"
 #define MyAppURL "https://github.com/BornToBeRoot/NETworkManager/"
 #define MyAppExeName "NETworkManager.exe"
@@ -69,3 +69,62 @@ Name: "{autodesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: de
 [Run]
 Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall skipifsilent
 
+[Code]
+{ ///////////////////////////////////////////////////////////////////// }
+function GetUninstallString(): String;
+var
+  sUnInstPath: String;
+  sUnInstallString: String;
+begin
+  sUnInstPath := ExpandConstant('Software\Microsoft\Windows\CurrentVersion\Uninstall\{#emit SetupSetting("AppId")}_is1');
+  sUnInstallString := '';
+  if not RegQueryStringValue(HKLM, sUnInstPath, 'UninstallString', sUnInstallString) then
+    RegQueryStringValue(HKCU, sUnInstPath, 'UninstallString', sUnInstallString);
+  Result := sUnInstallString;
+end;
+
+
+{ ///////////////////////////////////////////////////////////////////// }
+function IsUpgrade(): Boolean;
+begin
+  Result := (GetUninstallString() <> '');
+end;
+
+
+{ ///////////////////////////////////////////////////////////////////// }
+function UnInstallOldVersion(): Integer;
+var
+  sUnInstallString: String;
+  iResultCode: Integer;
+begin
+{ Return Values: }
+{ 1 - uninstall string is empty }
+{ 2 - error executing the UnInstallString }
+{ 3 - successfully executed the UnInstallString }
+
+  { default return value }
+  Result := 0;
+
+  { get the uninstall string of the old app }
+  sUnInstallString := GetUninstallString();
+  if sUnInstallString <> '' then begin
+    sUnInstallString := RemoveQuotes(sUnInstallString);
+    if Exec(sUnInstallString, '/SILENT /NORESTART /SUPPRESSMSGBOXES','', SW_HIDE, ewWaitUntilTerminated, iResultCode) then
+      Result := 3
+    else
+      Result := 2;
+  end else
+    Result := 1;
+end;
+
+{ ///////////////////////////////////////////////////////////////////// }
+procedure CurStepChanged(CurStep: TSetupStep);
+begin
+  if (CurStep=ssInstall) then
+  begin
+    if (IsUpgrade()) then
+    begin
+      UnInstallOldVersion();
+    end;
+  end;
+end;

Source/GlobalAssemblyInfo.cs

@@ -6,5 +6,5 @@
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 
-[assembly: AssemblyVersion("2023.2.5.0")]
-[assembly: AssemblyFileVersion("2023.2.5.0")]
+[assembly: AssemblyVersion("2023.2.16.0")]
+[assembly: AssemblyFileVersion("2023.2.16.0")]