Incremental Parallel Upgrade Considerations - Incremental Parallel Upgrade Considerations - OnBase - Technical Requirements Overview for New Installations and Upgrades - OnBase/Technical-Requirements-Overview-for-New-Installations-and-Upgrades/English/Foundation-22.1/Technical-Requirements-Overview-for-New-Installations-and-Upgrades/Part-2-Support-Items-of-Note/Third-Party-Software-Support-Items/Microsoft-.NET-Framework/Incremental-Parallel-Upgrade-Considerations - English - Foundation 22.1

If you are performing Incremental Parallel Upgrades from OnBase 12 or earlier, it is recommended that you deploy two separate Application Servers: one Application Server running Microsoft .NET Framework 4.0 for OnBase 12 or earlier, and one Application Server running a currently supported version of Microsoft .NET Framework for OnBase Foundation 22.1. This will help you to avoid compatibility issues with different versions of Microsoft .NET Framework while performing the upgrade.