Quote from one user's feedback:
Tagflash working great again.
I will make a manual to help.
Only thing that you need to do, is download new tagflash setup from EcuHelpShop /Download area, and install it.
Delete FGtech USB driver from Windows Device Manager, and install new one from tagflash folder.
You MUST NOT uninstall the original tagflash installation. The new setup is missing some files. Hope that Oliver sort it out.
Done!