It was made for prestashop 1.3. Thanks to "prsut" who made the previous version.
Since I updated my shop to 1.4, I need this multi prices functionality with prices that I have set before on presta 1.3.
I have tested on version 188.8.131.52, it works as expected. But I didn't test deeper for On Sale, Taxes or other price related.
Any feedback would be appreciated.