Can't install fdroidclient

Hi all!.

I'm trying to install fdroidclient but the installation ends with a "application not installed" message.

I'm using lollipop 5.0.

I have enable the installation from unknown sources, and I can munually install apps browsing from f-droid page and downloading the apk files. They installs and works right. But the fdroidclient itself don't.

Any idea?

Thank you and regards