The files for the Steam version of MV will be located in Program Files (x86) -> Steam -> steamapps -> common -> RPG Maker MV. So unless your current MV isn't in that location, the files should be separate. As in you'll have 2 different MV's on your computer (someone correct me if I'm wrong).
like Frostorm said... you will have 2 different MV... one is PC version and one is Steam version... they are separate program... but there's a catch... somehow when having both of the MV... and you open your project by double clicking the "Game.rpgproject" files inside your project folder... your pc could get confused and did not open MV (it will register it as last open project although did not open MV)... so you need to open which MV you want to use... then open the project there... (or alternatively you could also open which MV program and with that program open... double click "Game.rpgproject")
hope this help.
as said above this will do nothing to your project.
I even use that to have two installations of Ace and MV each in different languages (one english and one in German) while I was still moderator here, because it made some checks easier.
I also would like to add that even if you update your MV editor version... your game project will retain the version WHEN that project created...
example your MV version is 1.5.1 and you create "MyGame" project...
then you update your editor to 1.6.1... the "MyGame" will still run on 1.5.1...
you need to update the js files in js folder with new version if you want your project to update (in MV we need to manual copy i think while in MZ there's a new command to do it from the editor).
>Testing with fonts change.
>Tries installing a plugin. Doesn't work.
>Tries changing the plugin commands. Doesn't work.
>Tries installing another plugin. Doesn't work.
>Changes a few more plugin commands. Doesn't work.
>Goes directly to the gamefont file and changes the src. Works.
Looking back at some sketches, and game design documents on my PC dated summer of 2015. I started development with the release of MZ, but in 2015, I felt a strong desire to make a game out of the blue. I remember feeling sad for no apparent reason, and all these ideas rushed into my head. Now that I think about it, since that day, everything has become easier to do on my PC . . . it’s very creepy.