Download Master makes me login after installing.

[BIGLEAGUE-007]

Hi there. I have Asuswrt-Merlin RT-AC68U Firmware 380.65_4. Everything seems to be working fine until i tried downloading "Download Master"under USB Application. For some reason when i download the manager,after it installs successfully i click on the yellow arrow to open and i get the routers GUI login screen except it says Please login into download master. I've tried my same username and password as router. I've tried admin/admin. I've tried every default password there is and no luck. I have a sandisk-ultra 128G in one of the USB ports for AiDisk and media server and samba. That is all functioning properly. Ive tried rebooting,uninstalling DM,reinstalling,Factory reset. Now i did have DM installed properly and working i believe on 380.62 version and when i upgraded to the next version i guess when i rebooted it just disappeared. I also have a DDNS enabled.I haven't tried to reinstall until now with the latest firmware. Any help would be greatly appreciated. Thanks.