[Koha] How configure OAI

Dear community, We are using Koha tarball 3.18.05 on Ubuntu 12.04.5. Resently we enabled in system preferences OAI-PHM , but we couldn't harvest record from Koha using MarcEdit. Is it nessesary to install SOPAC2 and how can we install it in our Koha version . Please, help with instructions. Thenks, Araik.