I'm Electrum 2.9.3 user and unfortunately also using Win7 64-bit on my main PC. I see I'll have to wait for update.
But I have also a Win10 machine and will give it a go there.

Have two questions to ask:

1/ Could someone explain in simple words, for the average users, what are the main benefits of Electrum 3.0 vs 2.9.3? What this segwit support is used for? Has this something to do with the forthcoming fork?

2/ If we are using ver.2.9.3 now, how shall be proceeded in installation process? Should we de-install the old version and re-install the new one, or we may install straight over v.2.9.3?

3/ Should we be in a hurry at all to install the 3.0 version?

Sorry if these question have been already asked but I couldn't see anywhere around here something explained or  installation manual.

But in addition, you should know that even if the BTG snapshot did catch your coins in Electrum wallet, you wouldn't have seen different chains for the time being simply because there is no BTG chain yet. They will launch it after November, the 1st. The method you read about probably should mainly be used with no replay protection forks.