You can also learn how to download and install the no-charge functionality as well as how to obtain trial versions that include the additional capabilities that are available for purchase.

您还将了解到如何下载和安装免费功能，以及如何获得包含额外收费功能的试用版。

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The thesis introduces how to install the software of "No 1 Military" project for client and maintain the client.

本文介绍了“军字一号”工程客户端软件系统的安装及客户端维护的基本方法。

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And be careful with any site asking you to install a program, no matter how beneficial it may seem - if it seems too good to be free, there might be something phishy about it.

BBC: Q&A: Phishing for your precious data