Never uninstall the old version before updating T3C system. This will result in data and, at worst, registration loss that cannot be restored unless you have backed up it. The installer is able to update T3C automatically if it finds an old version.
Within the organization, only one T3C Service node can be installed for data consistency and communication with the T3C Server. If you need to install multiple nodes, install T3C Service on a server computer and T3C Consoles on other computers.
Due to the compatibility of the transferred data between clients of T3C system, it is not possible to use an older version of the application than the one you have already used before.
After successful installation, please back up the updated configuration and private key.