download Modbusslave.h library in arduino

Please send me reply on my mail id

You're much more likely to get a ton of spam by posting your email on the forum than help with your problem. We prefer to help people publicly right here on the forum so that others may benefit from the knowledge we share. If I help you privately in an email then only you benefit. That's great for you, but what about all the other hundreds of thousands of Arduino users who need help. There isn't enough time in the day for me to help all of them individually.

You need to provide a detailed description of the problem you're having. If you won't make that effort, why should we make the effort to help you? It wouldn't have taken any more time than you already spent cross posting the same question to an ancient thread.