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TI 官网下载的PCB设计文档打开是空白的

Other Parts Discussed in Thread: CC2540

请问在TI官网上下载的PCB设计文档如何打开才能看到图层尼?

我在CC2540USB-RD CC2540 USB 软件狗参考设计 | 德州仪器 TI.com.cn  http://www.ti.com.cn/tool/cn/cc2540usb-rd

下载的设计文档中的PCB打开是空白的(付费版的Altium Designer),如下图: