Boot from a USB HDD with two partitions

I have a 1Tb USB3 External HDD
Two primary partitions, the second one has data, the first one is empty.

I would like to install EASY2BOOT in the first one.
When I launch the installer, it says "WARNING: ALL PARTITIONS ON DRIVE 1 WILL BE DESTROYED..."

I don't want to destroy the second partition.

What can I do?
Thanks.
John 26/10/2016

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