when you uninstall the tooltip NT the folder in Program files(x86) will not removed. you have to restart your system and then delete this folder. when you get an error message that APL385.ttf can not be replace, ignore and continue the installation. when it comes to the OCX registration error especially for 2020 version, the following VC++ redistributable package installation will solve the problem. so before installing tool tip NT download and install this.
it will resolve the error.