I would not recommend to use CastXMR, use every other miner except this one. It is not open sourced and also it is not as trutable as Doktor83 with his SRBMiner.
Also ESET keeps block this web for me some something shady is there.
You better stick with classics like XMR-STAK (also our port XMR-AEON-STAK it is open sourced too on Github), XMRig and the new SRBMiner.