I'm sorry for the inconvenience about the upgrade. If the upgrade is taking too long I suggest to manually remove the Trend Micro program on your computer and install it manually. Download the latest version of Trend Micro here and run the file after the download to start the installation.
About your second concern, Trend Micro has to remove first the other antivirus program because it will be conflicting with them. They have different functions that makes it conflict with each other. Kindly click the link below to know what are the programs that should be remove before installing Trend Micro Security.