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Is the computer 32or 64 bit? What OS is it running?
If you are just using DecoderPro, you can probably jump right up to current but Java will need to be upgraded to at least 11 prior to upgrading JMRI.
See for help upgrading Java, there are limited Java options for 32 bit computers.
What OS are you using? If it's Windows, just select backup when doing the JMRI install. Updates do not touch the user files.

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Peter Ulvestad
Linux Mint 22.1, JMRI 5.11.3plus, Java 21.0.5
JMRI Users Group Moderator ( /g/jmriusers )
JMRI Developers Group Moderator ( )
Tam Valley Group Moderator ( )
Sprog-DCC Group Moderator ( )
Edmonton Model Railroad Association ( )