After you have signed up for Trimble Connect, you will be able to access the Trimble Connect App Store, where you can download the Object Manager installation file.
You don't need to delete previous versions before installing.
To install Trimble Connect Object Manager
Download Trimble Connect Object Manager from the Trimble Connect App Store.
Locate and double-click on the Installer file (probably in your Downloads folder).
This will open the Install Wizard.
Next you will be asked to accept the license agreement.
Next you can decide to install Trimble Connect for Windows to a non default location
(C:\Program Files\Trimble\Trimble Connect Object Manager\).
Trimble Connect Object Manager will then be installed.