Reinstalling operating system on an iMac

over the years, I have loaded the os on my iMac and am now under OS X El Capitan.  I always thought that the is something I could do if I have problems that I could not resolve otherwise.  recently, when I look a my profile that apple shows I downloaded the OS on 6 different products.   Is not sense to me because I used to use the method starting by holding down the R and sign in.  I was told to do this time several Apple support.

Is there a way to fix this, because I apparently have more than 1 download until I am cut off.

Could you please be a little more specific? What product do you mean?

Tags: Mac

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