Upgrade the Linux Server 7.5

Hello Team,

Hope all are doing Well, As currently am going to upgrade the Linux And CentOs Clients(Servers) from the Version of 14.2.758 to 14.2.build 1023. 

As my Question are below 

1.We can install SEP without removing old version of SEP?

2. Or We have to uninstall old SEP and we have to install new version of SEP ?

3. So we are on Servers services only going to stop and restart right ,So no need of reboot right ?

kINDLY PROVIDE A SOLUTION ON ABOVE DETAILS