Backup Exec remote agent can be installed manually on a windows server as well. Lets check it.
On Backup Exec media serve > Go to C:\Program Files\Veritas\Backup Exec\Agents > copy folder RAWSx64 / RAWS32 on the remote server
Now post copying the RAWS folder you can run the setup file
The installation window pops up > click Next
Choose Local Install
Here is the option to change the file installation directory to any other folder or drive
Now click Install
Now remote agent installation begins
Now the Remote Agent is successful
Now you can go to Backup Exec server and add the remote server where remote agent has been installed manually. Now you can go to Backup Exec media server and add the server with option >Add server.