Hello khitsk21267,
Yes providing log could be useful. The message shows that the installer is looking for a 4.24 version of the plugin installer. The only reason would be that it needs it to uninstall that version prior to install the 4.26.2.
I will check with the team if that is the expected behaviour.
Did you try to uninstall the datasmith plugin from windows> Add or Remove programs?
Bests,
Flavien.