This message shows when Tableau Desktop is a further ahead version than Tableau Server, so you have two options to resolve it:
- Use Tableau Desktop 10.1.x
- Upgrade Tableau Server to 10.3.x
To answer your main question as to how to upgrade Tableau Server, I recommend taking a look at the following:
I highly recommend taking full backups of Tableau Server and performing the upgrade in a development environment if you were not planning to do so already.
I hope this helps!
I can use 10.1 but I believe all my files are 10.3 and I don't think they are backwards compatible or are they?
They would not work on an earlier version of Tableau Desktop natively as backwards compatibility is not built in between versions -- Version Compatibility Between Tableau Desktop and Tableau Server
You could try out a conversion tool that was blogged about a little over a year ago and see if your Tableau Desktop 10.3 workbooks could convert to be used in Tableau Desktop 10.1: Convert the version of your Tableau files with this handy tool | Tableau Software. It might be worth a shot, but definitely have a backup, just in case.