With regards and respect, due to the recent restrictions and filtering of the Revolution Slider site in Iran, we cannot install this plugin through the plugins inside the template. What help can you give?
Is there any error message when you try to install this plugin?
If yes, please, send a screenshot showing it.
If not, please send us the WordPress dashboard and FTP access, and your license key privately thru the contact form, which is on the right side at http://themeforest.net/user/muffingroup#contact and we will check what might be the reason.
Please attach a link to this forum discussion.
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Therefore, please make sure that the data you are sending are complete and correct.