S.C.T.F. Professional Contracts was a Full Conversion Mod released in November 1, 2014. The first work was an intentional reskin of the original CS 1.6 with some enhanced gameplay features.
The original trailer is here: Youtu.be
The MOD was a kickstart to a series of other mods in the same series, including Professional Contracts 2 (Released in November 29, 2015 - Youtu.be ) and S.C.T.F. BL!TZ (Released in June 8, 2016 - Youtu.be ) which expanded even more the original CS 1.6 framework into something deeper.
5 years later, S.C.T.F. now returns with a "Remastered" version of Professional Contracts, with vastly improved aesthetics, gameplay balance and gamemodes - while retaining the spirit of the original work.