when i try to add .net reactor in my vs professional 2015 it is showin

There are a couple of reasons why you might encounter this error message "can't copy file dotnet reactor as package.dll to visual studio 2015 extension directory" even after closing all Visual Studio instances. Here are some steps you can try to troubleshoot the issue:

1. Check for Hidden Visual Studio Instances:

• Sometimes, Visual Studio processes might linger in the background even after closing the main window. Try the following:
  • Open Task Manager (Ctrl+Shift+Esc).
  • Go to the "Details" tab.
  • Look for processes containing "devenv.exe" (the Visual Studio development environment process).
  • Right-click and select "End Task" for any lingering Visual Studio processes.

2. Administrator Privileges:

• Installing extensions might require administrator privileges. Try running Visual Studio as administrator and then attempt to install the .NET Reactor extension.

3. Conflicting Files:

• Occasionally, corrupted or conflicting files can prevent copying the package.dll. Try the following:
  • Clean Build: Rebuild your project(s) to ensure there are no leftover files causing conflicts.
  • Temporary Directory Issue: In rare cases, the temporary directory used by Visual Studio might be corrupt. Try restarting your computer to clear temporary files.

4. Extension Compatibility:

• Double-check if the .NET Reactor extension is compatible with Visual Studio 2015. Some extensions might only work with newer versions. Consult the extension documentation or developer website for compatibility information.

5. Manual Installation (Alternative):

• If the automatic installation through the Extension Manager fails consistently, some extensions offer manual installation options. Check the extension's documentation or website for instructions on manual installation.

Additional Tips:

• Make sure you have a stable internet connection if the extension is downloaded during installation.
• Consider temporarily disabling your antivirus software to see if it's interfering with the installation process. Remember to re-enable it afterward.

If none of these solutions work, you might need to search for specific troubleshooting steps related to the .NET Reactor extension or contact the extension developer for further assistance.