'The Plugin Version I Expected is Not What I Found' Appears in Logs
A stacktrace and a long series of unhappy messages in the logfile. A dialogue box with the following contents:
The plugin version I expected is not what I found Plugin Key: <plugin name> Expected: <version number> Found: <different version number> Are you sure you would like to continue installing?
Plugin author forgot to update
Notify the plugin author, and explain that they need to fix
atlassian-plugin.xml for that version of that plugin.