Magento

I get this error every time I try to use Magento Connect:

Failed to download magento-core/Interface_Frontend_Default_Modern within preferred state “stable”, latest release is version 1.0.19702, stability “beta”, use “channel://connect.magentocommerce.com/core/Interface_Frontend_Default_Modern-1.0.19702” to install
Cannot initialize ‘channel://connect.magentocommerce.com/core/Interface_Frontend_Default_Modern’, invalid or missing package file
Install Errors
Package “channel://connect.magentocommerce.com/core/Interface_Frontend_Default_Modern” is not valid
PEAR ERROR: install failed

Any ideas?

I have the same problem.
I solve it : in your Magento Connect Manager (in your site) change in Settings Tab, Stable to Beta (depends on state for the extension you want download).
I hope this may help you.

I have the same problem. Have changed the tab to make sure release matches and still not working.