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EM Library: error when installing or upgrading Sophos small business solutions

Issue
When re-installing or upgrading Sophos small business solutions, the following error is displayed and you cannot continue with the installation:

Setup has detected a version of Sophos EM Library Installed, please uninstall this and run setup again.

In the Application event log, you may find this entry:

Description: Product: Sophos Anti-Virus Small Business Edtion -- Installation operation failed Source: MsiInstaller Event ID: 11708

What to do

If you need more information or guidance, then please contact technical support.