When I have installed with success your version on JMS that does not yet have DT register and JEvents installed.
After, I have used the JMS tool to re-install with success the DTRegister and JEvents in a slave site.
I also tried to install a DTRegister 2.5 on a master + a slave and after uninstall the DT Register in the master and re-install the DTRegister 2.6.4 in the master AND in the slave site.
It has worked and updated the DT Register table to add the new colums in both master and the slave site.
If you want that we have a look on your server, this is possible with our billable support that you can order at
www.jms2win.com/download?page=shop.produ...35&category_id=1