安装完成后关闭软件，打开软件安装目录，找到LocalConfig.xml文件，用记事本打开，把里面的“zh_cn”改为“en_us”。然后新建记事本，把以下代码粘帖进去，重命名为fpmkey.txt，把fpmkey.txt文件放到LocalConfig.xml文件同目录里即可

代码为 

[Foxit License]
SN=FPMRK1913
Modules=Express,PDF/A validation,DocProcess,TouchUp,PageFormat,FormDesigner,Organizer,CertificateEncryption,DigtalSignature,OCR,PDF2Other,Optimizer,Redaction,CertifyDocument,RMSProtector,RMSPolicyManager,HighCompression,Advanced Editor
Users=1
Licensee=Mario Steiner
LicenseDate=2011/06/12
Sign=7B20D9F4EE9D35E10357C1649A7A8CCB34C4E86386939D0F0EDEC74AB24A2B25B827BAEE3341F14A
Restrictions=Ver:5,Keyver:2,Edition:Business,Code:30101-03000-NR100,Lang:en_us