Mayby Website x5 did not close correctly. And it is still in memory, open up your taskmanager, remove all websitex5.exe in process tab. Then try again. Do this during update (directly after the update program has closed X5)

Opening taskmanager depend on you OS. ctrl and shift and escape is the most common keys (all together)
Or
Type in at start -> run -> taskmgr and enter

where are the free (recent purchase) upgrades???

 I have a v9 purchase I made for another license jan 17th and I didn't get a free upgrade...

Buenos días, me aparece el Error 406 al intentar actualizar a la version 10.0.2.24, ya he desactivado el antivirus y el firewall y me sigue dando el error que puedo hacer para solucionarlo, gracias y saludos.

after updating from 10.xxx.20 to 10.xx.24 all the layout was changed. I corrected 2 hours and than wanted to save. Then the software hang up while saving the project. please test your updates before you release them. this was 2 hours wasted time