The current version of the installer cannot install the application in the same folder as the executable, that is because, during the installation process, the updater is copied to the destination directory and then is executed from there except that this time it will know it's installed and won't ask for a location anymore. So just keep the updater.exe in your usual Download directory, execute it and chose where you want to install it and then you can remove the updater.exe from the Download directory. (Not applicable anymore)
As for how to uninstall it it's very easy, the installer does not create any registry key or different directory so you can just remove the directory. (You may want to clear the app cache in %appdata%USB_HELPER/ too).
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Thanks
Is it the app or the installer which crashes?