2 question: How to update RPCS3 and which is the best graphic renderer/resolution?

hi guys,

1) which is the right way in order to updsate RCPS3? Have I simply to overwrite the new rcps3.exe file ? Or have i to overwrite ALL the files of the new package in the folder where i have the previuous RCPS3 version?

2) is it better to use OpneGL or Vulkan?  I have a cpu i5 4690K overclocked to 4.2Ghz, a GTX970 and 8Gb RAM DDR3. With Windows 10 64bit.   And which is the best resolution? The recommender is 1280x720...why? Is it possible to play in 1920x1080?

thanks