xbee rs485 adapter


I have a brand new Xbee RS485 adapter.
Needed to manually install firmware in xctu for it to appear in configuration.
(The auto background firmware update did not install it)
Now I need to change to API mode.
Using update radio firmware i get the dialog:
Error updating the radio firmware:
File ‘XBP24-ZB_22A7_S2B.ehx2’ or ‘XBP24-ZB_22A7_S2B.ebin’ does not exist.
How to find, how to install?

Tried reinstall xctu, tried running xctu in admin mode, no success.