Updating programmes - do I delete past programmes?

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i've been using cc years, , when updates programme eg: photoshop or illustrator, puts in new version (photoshop 2015) in applications folder previous version left - it's not updated, it's downloaded whole new programme looks. (?)
do delete previous version or there parts of still in use in new version?

my programmes running slow, i'm assuming there conflict between two.

 

please tell me whether should deleting past versions, , 'uninstall' them first well.

 

thanks, i'm not tech savvy.

the older versions have own folders , files. if want rid of older version folder should ok.



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