upgrade to v18- connect, ssl, ipsec

Thinking about upgrading- I currently have 5 other V17 XGs connecting via IPSEC VPN, a few SSL VPN users and about 30 Sophos Connect users connected

Will they all still be connected after the upgrade or is there a need to update the end users manually and reconnect them?

 

With Connect we are on 1.3 and V18 is on 1.4 is v18 okay with 1.3? 

With SSL and Connect- do the clients upgrade on the users side automagically or is that also a manual process? 

 

Any advice is greatly appreciated