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I got Porsche Design Desktop Drive USB 3.0 5TB.

Their website

http://www.lacie.com/gb/en/support/desktop-storage/porsche-design-desktop-mac/

list these:

LaCie Firmware Updater for Mac
USB 3.0 LaCie USB 3.0 (Mac) Driver

I already moved stuff to it and it seems to work fine in newish MBP Sierra.

Do i need to install these and can i do it even there is already files in new drive?

The firmware update should not affect the data on the hard drive. If you want piece of mind, make a backup of the data before applying the firmware update to the enclosure.
 
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