Yes, all desktop application components (of previous version) should be removed before installation of version 10.0. To uninstall it completely here are steps to follow:
1- Uninstall TelegramFxCopier from Control Panel
2- Remove Folder "TelegramFxCopier" and/or "TelegramfxCopier_V10" Located in: C:\Users\[USERNAME]\AppData\Roaming\MetaQuotes\Terminal\Common\Files