Yes, it is necessary to remove all components of the previous version of the desktop application before installing any updated version. To ensure a complete uninstallation, please follow these steps:

1. Go to the Control Panel on your computer and uninstall TelegramFXCopier from there.

2. Locate and remove the folder named "TelegramFXCopier" and/or "TelegramFXCopier v11.8" in the following directories:
- C:\Users\[USERNAME]\AppData\Roaming\MetaQuotes\Terminal\Common\Files
- C:\Users\[USERNAME]\AppData\Roaming\MetaQuotes\MQL\D0E8209F77C8CF37AD8BF550E51FF075\experts\telegramfxcopier

By following these steps, you can ensure the complete removal of the previous version of TelegramFXCopier, making way for a clean installation of the updated version.