Plugin installation failling

Hello,

I am installing the required plugins and two of them are failing.
Here is what I get when I attempt to install them

Installing Plugin: Fundingpress custom post types
Downloading install package from http://skywarriorthemes.com/plugins/funding_custom_post_types.zip…

Download failed. cURL error 60: SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

Plugin not activated. A higher version of Fundingpress custom post types is needed for this theme. Please update the plugin.

Return to Required Plugins Installer

Installing Plugin: LayerSlider
The plugin does not have a valid header.
Downloading install package from http://skywarriorthemes.com/plugins/layerslider.zip…

Download failed. cURL error 60: SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

Return to Required Plugins Installer

please let me know what needs to be done in order to fix these issues.

thank you