A:AnswerUpgrading processors is not a simple process. It would be better to choose a laptop that has the specs you want already. However, yes, the RAM can be updated to a max 16GB.
A:AnswerIt supports two sticks of RAM as well as an M.2 SSD. Here is the maintenance and service guide for this model: http://h10032.www1.hp.com/ctg/Manual/c06146792
A:AnswerAny computer that comes with Windows 10 in S mode can be turned off. It is a one way street though, you can never return to S mode. S mode exists to keep the computer completely secure.
A:AnswerMake sure you have some malware and antivirus SW. Usually the suite is the way to go. Too many options and I tend to look for best price. I lean towards trend micro as my personal preference. Many internet providers include in their subscriptions, such as Comcast and ATT.
A:AnswerCheck the minimum spec requirements for the game and what the laptop has. Do research. It might, but not very well and it will likely have stuttering or heat up quickly.