In some cases, the uninstaller may ask you to restart a PC. It means that some part of the program is being used and cannot be removed due to a lock. For example, you uninstall
AlterCam when the virtual webcam is active in some other app. In this case, you will completely remove the program after you restart the PC. Typically, you can restart the PC anytime. Therefore, there is no hurry to make it right after you are asked for it.