Ok, If you can find the bundle id of the old version, you can uninstall it and then install and activate the new one. I think something like this should work:
openhab> bundle:list | grep Calculations
303 │ Active │ 80 │ 3.2.0 │ openHAB Add-ons :: Bundles :: Weather Calculations Binding
openhab> bundle:uninstall 303
openhab> bundle:install https://bitbucket.org/hww3/org.openhab.binding.weathercalculations/downloads/org.openhab.binding.weathercalculations-3.2.1.jar
Bundle ID: 245
openhab> bundle:start 245
openhab> bundle:list 245
START LEVEL 100 , List Threshold: 50
ID │ State │ Lvl │ Version │ Name
────┼────────┼─────┼─────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────
245 │ Active │ 80 │ 3.2.1 │ openHAB Add-ons :: Bundles :: Weather Calculations Binding