I've been using this method for a couple months now and, although it lacks some. I am only posting this because I have seen quite a few posts in the past couple months asking about it and figured this might help a few people out.

Vsyor is just the first software to mirrorscreen android to pc I have found, if you find any better software (for example one, where you can get into fullscreen without paying for an extra version, tho), please tell it to me. This might break the rules, as I didn't read them (sorry), but this is not an emulator. Thats it actually, you can use android / snapchat on your pc with this. You may enable usb-debugging in your options on android. After that, you start both of them and connect your PC with your phone through an USB wire. First, you install it for chrome as an addon, second as app on your phone. This is an app to mirrorscreen your android to your pc. No matter why someone is using snapchat on PC, I have found a way using vysor. Lets be honest, most of us, including me, are doing this only because we want to screen without letting the other know. I know that this subreddit is related to bluestacks and that the problem is something that primary hits bluestacks users, but I guess a lot of people will search this subreddit when trying to use snapchat on windows. Some may have the same problem like me that they want to use snapchat on pc and that they cant login.

Snapchat pc no bluestacks reddit