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v5 to v6 client upgrade issues on ERA6

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I'm in the process of migrating from ERA5 to 6, along with all client PCs.  I made a new server for v6 and imported the database from the v5 server and have pushed out the agent to all client PCs which are Win7/10, all PCs are running v5.0.2665.  Some installations work, but when I push out an installation to upgrade the client from 5 to 6 about 90% of them fail with :


'SoftwareInstallation:Installation failed with: (0x643), Fatal error during installation (0x643), The older version of ESET Endpoint Antivirus cannot be removed'


Which leaves the PC without any AV protection as the installation failed, and neither v5 or v6 works, it can only be resolved by booting to safe mode and running the remover tool.


I have a network of 300 PCs to manage and Eset are telling me that I'll need to manually upgrade each PC which is not feasible.  I can't believe there is no way of completing a successful remote install from v5 to v6


Any ideas please?

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