I have my Mac Book Pro with the OS Yesomite since a month and I am feeling that my mac is getting slower than before a month. I want to install OS Lion on my mac.  I think i have a DVD of OS Lion which comes when i bougnt Mac laptop in 2011.

I have my Mac Book Pro with the OS Yesomite since a month and I am feeling that my mac is getting slower than before a month. I want to install OS Lion on my mac.  I think i have a DVD of OS Lion which comes when i bougnt Mac laptop in 2011. Should i install OS Lion? What wil happen if i install OS Lion, do i lost my Applications or ...????

Hi, the last install dvd that came out for mac's was Snow Leopard,10.6.3. Lion is a download from apple. You cannot just install it over Yosemite. You would have to backup your drive to save files you want and do a clean install. You might want to look into getting more memory. You can run 8 Gig"s of memory on your Macbook Pro.If your Macbook Pro is getting really slow you might want to download EtreCheck  and then post the results here.http://www.etresoft.com/etrecheck  Check out this article.  http://support.apple.com/kb/PH19031

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