mavericks mid 2012 macbook pro

Hi, been awhile since I've done a new installation or reinstall on any of my machines and just needed a refresh on a couple of things. I have a Mini quad i7 -2012 - that my studio needs to run Mavericks on, for a certain piece of 'legacy' software that won't work well with newer OSX. The...

I bought a mac book pro, mid 2012, retina version- from somebody I didn't know, off of craigslist. First mistake. It seemed to work fine, but after awhile it started freezing often and then the folder with a question mark started to appear. I was told that all I had to do was make a bootable USB...

After I saw bad reviews claiming lags, battery issues, performance, overheating etc... I was wondering updating my MBP running mavericks to el capitan would give a better improvement. What do you guys think about it? The specs are: Macbook pro mid 2012 13" Intel core i5 16gb ram memory 500gb...