If your FileCap Server is still running on FileCap Server version 3, then migrating from FileCap Server version 3.x.x to FileCap Server version 4.x.x is not possible by using the update mechanism in FileCap version 3 anymore. The FileCap version 3 server will be broken after using the update mechanism.
Why is directly upgrading from V3 to V4 not possible anymore?
The reason that the update mechanism in FileCap version 3 is not working anymore is because FileCap version 3 is pretty outdated and the Debian version used as operating system is not supported by Debian anymore. Because of this some Debian packages needed for updating are not available anymore so the update will fail.
Why do you need to upgrade to FileCap V4
Because the operating system used for FileCap version 4 is still supported by Debian, it will receive security updates. Also FileCap version 4 is having a lot of new features and security changes which are not available when using FileCap version 3.
Can i update my FileCap V3 server to FileCap V4 without losing data?
Yes this is possible. It is best to contact FileCap Support they can provide a script which you can use to do the migration of all settings and data to a new FileCap version 4 server. Please keep in mind this process can take a while depending on how much data is needed to be transferred.
Also the licensing system is changed in FileCap Server version 4, so it is not possible to use the FileCap version 3 license in the FileCap version 4 server.
When you contact FileCap Sales or support we can change your currently valid version 3 license to a version 4 license.
Do i also need to update the FileCap plugins?
Yes, because of new features and upgraded security settings in FileCap version 4 it is advised to update all FileCap plugins (like the FileCap Outlook Plugin) to the latest version before migrating the server to FileCap version 4.