When running the AgentInstall.msi provided with agent package upgrade or agent hotfix, you get the following error:
Another version of this product is already installed. Installation of this version cannot continue.
To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel.
Agent hotfix or upgrade are provided in AgentInstall.msi package. Using the installation command:
msiexec /i AgentInstall.msi /q INSTALLDIR="C:\Program Files\Manufacturer\Endpoint Agent\" ENDPOINTSERVER="hostname" SMC="smc.hostname" KEY="" SERVICENAME="EDPA" WATCHDOGNAME="WDP" ARPSYSTEMCOMPONENT="1" will return the error.
This command is included in the install_agent.bat provided with the package.
To solve this issue use the following command instead:
msiexec /i AgentInstall.msi /q REINSTALL=ALL REINSTALLMODE=vomus
NB: This command should ONLY be used for minor upgrades and patches.