试用版只能保存供测试用的控件模板文件。
Trial version only can save control template file for testing.
Trial version can only be saved for testing the control template file.
Using trial version, the control template file only can be saved for testing.
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Using trial version, the control template file only can be saved for testing.
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试用版（主语)+保存（谓语）+控件模板文件（宾语）
所以：
Trial version can only save control template file for testing!
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agree with do_i
Trial version can only save control template files for testing.
------解决方案--------------------------------------------------------
试用版只能保存供测试用的控件模板文件。
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Only control(component?) template files for testing can be saved in the trial version.