Ok, so I went into the installation folder, and I opened the file called "SMBX2.exe".
Although I had not installed the vc_redist, which in my case should have been 64-bit, I already had a later version.
So as I thought there would be no problem, I ran the file. The Task Manager showed this process:
As I saw that nothing was happening, I thought it would take a while to start, so I left it open for about half an hour, nothing happened, so I closed it and looked for .exe files in the folder. I found one called "pge_editor.exe".
When I executed it, the editor opened, or what appeared to be one (It shows in Spanish 'cause I'm from Mexico).
I also ran the "SMBXLauncher.exe" and nothing happened either.
I ran the "smbx.exe"

and it showed the following screen:
I clicked on editor and this screen appeared:
So my question is if something has to happen with the launcher or if it's just to be able to play levels or something like that.
I hope I have explained well.