The problem you have here is that Developer is a higher version than Standard so you can't upgrade that way.
You would need to uninstall standard then install Developer.
Backup and reinstall databases - or detach and reattach them.
For and sys jobs etc you have the easiest method would be to script them out then reapply them.
I am not sure of the best way to copy logins and user permissions though.
I beg your Pardon you can upgrade from Developer to standard
I upgraded standard to dev with this:
start /wait d:\setup.exe instancename=MSSQLSERVER upgrade=SQL_Engine,SQL_Data_Files,SQL_Tools90,SQL_Replication skuupgrade=1 /qb
The same as you but no addlocal and a few other features in the upgrade list