Scared to download new version "Yosemite" I heard it does not work well on older versions like 10.7.5

I am worried about downloading the latest version of yosemite on my macbook pro "10.7.5" for the reason that downloading the latest version for iphones actually killed my phone.
IT would not turn off anymore and the battery died in about 3 hrs even without use.
My friend did it and said he is unable to use iphoto anymore from his computer and other things are not functioning as well.
Any help on this.?
Would it make a difference if i took my computer to an Apple store to have them do that for me.?
Since the new downloads on my phone ""which is useless now"" i am sooo upset at them for not caring about the amount of money it cost me for their wrongful versions.
I can't afford to lose my computer as well as the phone just for new versions?.

As long as you don't have any carpware on your Mac such a so called "cleanup" software, AV software, memory cleanup apps or the like, you should not have any problems at all.
If you are that concerned with Yosemite then I would suggest that you create a partition and install and test Yosemite on the partition.
Once you have tested in its own partition when you find that are no problems then you can move it to your production partition.
Since I am a member of the beta test team, I always run the beta code in its own partition. When I am going to do some testing I reboot to the partition with the beta code and test over there.

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