Magento扩展在安装时出现问题

我正在使用magento“J2TRememberMe”中的扩展，但在安装时它给我带来了问题。它显示的信息如下：

"Failed to download magento-community/J2TRememberMe within preferred state "stable", latest release is version 1.0, stability "beta", use "channel://connect.magentocommerce.com/community/J2TRememberMe-1.0" to install

Cannot initialize 'channel://connect.magentocommerce.com/community/J2TRememberMe', invalid or missing package file

Install Errors
Package "channel://connect.magentocommerce.com/community/J2TRememberMe" is not valid
PEAR ERROR: install failed"

有人知道怎么解决吗

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感谢在选项卡设置中，将首选状态从“稳定”更改为“测试版”

Magento Connect在后端使用PEAR。PEAR是一个PHP包管理系统，它源于同名的PHP代码库。试着用钥匙

community/J2TRememberMe-1.0

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安装您的模块。模块键看起来是PEAR URI

我已经试过了…现在它的错误是“提供的包标识符无效：community/J2TRememberMe-1.0”