下载待升级包（linux一键安装包）

[root@izwz9fnxall7j07rfgkvwqz opt]# wget http://dl.cnezsoft.com/zentao/9.5.1/ZenTaoPMS.9.5.1.zip
--2017-10-10 15:34:23--  http://dl.cnezsoft.com/zentao/9.5.1/ZenTaoPMS.9.5.1.zip
Resolving dl.cnezsoft.com (dl.cnezsoft.com)... 119.167.164.115, 121.31.30.201, 27.221.54.190, ...
Connecting to dl.cnezsoft.com (dl.cnezsoft.com)|119.167.164.115|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 5835657 (5.6M) [application/zip]
Saving to: ‘ZenTaoPMS.9.5.1.zip’

100%[==================================================================================================================================================>] 5,835,657   9.50MB/s   in 0.6s   

2017-10-10 15:34:24 (9.50 MB/s) - ‘ZenTaoPMS.9.5.1.zip’ saved [5835657/5835657]

[root@izwz9fnxall7j07rfgkvwqz opt]# 

备份源程序

tar -zcvf zentaopms.tar.gz zentaopms/

解压程序

[root@izwz9fnxall7j07rfgkvwqz opt]# unzip ZenTaoPMS.9.5.1.zip 
Archive:  ZenTaoPMS.9.5.1.zip
replace zentaopms/module/company/css/browse.css? [y]es, [n]o, [A]ll, [N]one, [r]ename: A
  inflating: zentaopms/module/company/css/browse.css  
  inflating: zentaopms/module/company/css/dynamic.css  
 extracting: zentaopms/module/company/js/view.js  
  inflating: zentaopms/module/company/js/dynamic.js  

然后访问http:/ip地址/zentao/upgrade.php，按照页面提示进行升级。

如果 提示“安全起见，请删除/data/lampp/htdocs/zentaopms16011901/www目录下的install.php和upgrade.php文件。
Please remove install.php and upgrade.php under /data/lampp/htdocs/zentaopms16011901/www dir for security reason.
无法升级”
请重启nginx，应该是缓存导致的