无法在Eclipse Luna 4.4.2上安装RadRails

我正在尝试使用以下更新站点在新的Eclipse Luna实例（4.4.2）上安装RadRails插件：http : //download.aptana.com/tools/radrails/plugin/install/radrails-bundle

但是它总是失败，并显示以下错误：

由于找不到一个或多个必需项，因此无法完成安装。正在安装的软件：Aptana RadRails 2.0.5.1278709071-79-7D7BFZcLCUQRF2NWAQhRBC1qP（com.aptana.radrails.feature.feature.group 2.0.5.1278709071-79-7D7BFZcLCUQRF2NWAQhRBC1qP）缺少的要求：Aptana Editor基础设施2.0-5.1278523018 .ide.feature.editors.feature.group 2.0.5.1278523018-8o57z9icbz-hWlJZG）需要“ org.eclipse.update.ui 0.0.0”，但找不到

无法满足依赖关系：来自：Aptana Web开发工具2.0.5.1278614541-7D-7O7iRJci-jVhz-KFyoijH（com.aptana.ide.feature.feature.group 2.0.5.1278614541-7D-7O7iRJci-jVhz-KFyoijH）至：com.aptana .ide.feature.editors.feature.group [2.0.5.1278523018-8o57z9icbz-hWlJZG]无法满足依赖性：来自：Aptana RadRails 2.0.5.1278709071-79-7D7BFZcLCUQRF2NWAQhRBC1qP（com.aptana.radrails.feature.feature.group 2.0.5.15.1278709 79-7D7BFZcLCUQRF2NWAQhRBC1qP）收件人：com.aptana.ide.feature.feature.group [2.0.5.1278614541-7D-7O7iRJci-jVhz-KFyoijH]

我应该如何安装RadRails？