If the Encyro Outlook Addin sent you to this page to install the latest version, then you had used the web based installer to install the addin last time. For this case, installing the update is straightforward, just download the setup.exe linked below and click on the downloaded file to install.
There is no need to uninstall the previous version.
Restart Outlook after the installation is complete.
Note: If you did not install directly from the website but had used a troubleshooting article to get a different installer, then please see the instructions here on how to update.