
I hired a freelancer to create a logo for one of my clients and the freelancer can't be reached anymore (I have no idea why, he just went offline yesterday after he gave me the files for my logo).
Anyway, long story short I have some .ai files and a few .pngs and I need to make some small modifications to them before I deliver the logo to my client and I don't know how to make these modifications or where to start.
I have about 12 hours before I deliver the logo in its final state and being so pressed by time I don't have the mental strength and motivation to start learning inkscape (it's the free program I found in google to be dealing with .ai files) in such a short time.
So again (sorry for digressing) I need to make these small modifications (change a color, a font type, maybe the position of a line, etc) to my logo in the next 10-12 hours and I don't know where to start or what to do exactly as I have never been into designing and inkscape (just like any other designing tool) looks very intimidating to me.
Can I please get a few tips (in the dumbest-proof way possible) on how exactly to edit the elements in the file? By the way, which file do I need to work on - the .ai or .png? I already opened a .png but I can't separate the elements (lines from text, items, etc) to work with each one individually and when I opened an .ai file inkscape crashed

Again, if you know what I must do and can share the knowledge, then I'm all ears.
Thanks and I look forward to your replies
John