Assuming you have already shut down and rebooted the PC.
Have you tried temporarily disabling anti-virus apps?

Sometimes the updater does not behave the way it should on some PCs. You may try a repair install (reinstall without uninstalling) using the latest SF Pro-14 build from the Magix Download Center.

btw, welcome to the Magix Sound Forge users community @Daesung-Choi. If you want tech support directly from Magix staff, request a support ticket.
https://www.magix.com/us/support/technical-support/