100%成功的是这种:
WinRunner安装心得
重装系统后，发现用论坛中的方法安装WinRunner7.6还是有问题, 总是提示14天有效。后来发现在C:\Program Files\Common Files\Mercury Interactive有一个License Manager目录，里面有一个lservrc文件。这个文件就是MI工具的注册管理器，把里面的内容替换成下面的内容，就大功 告成了：
5SFDHYECAW7F8V8ULAEHCVYQSIRG93D29XAQ8KKM4FC#
# Dynamically installed.
FF2VLB3CX43FE7GRYIB3W96MVFUFK7UX5IM6DTS2WL4YR8JS4N27M6DWEM9
# Dynamically installed.
G8A9EF79GM5Z7C2V6IKBQZ64773ZBDCLMWETBCRHBG57634GFVY9K#
# Dynamically installed.
NRDDL7SPI9LDT5PUG8E4MHVA2933VROPSPBIEZ95JLHMH48OC7P8UEFJXNLR GG8W274AHT
# Dynamically installed.
。
不要忘了把自己机器的时间调到2005

Ｓome handsome boys or preety girls told that " Install the WinRunner7.6 (english version) on my machine.  But I don't have license key."
ok ,now ,i would share you a mean to solve this kind of problem.

Step 1: you should open the folder of "C:\Program Files\Common Files\Mercury Interactive\License Manager" ,and you could see a file named "lservrc".
Step 2: PlZ open the "lservrc" by wordpad(写字板)

Step 3: This step is most important. Take care,please!
You should delete all the content of this file ,rewrite the following words:

5SFDHYECAW7F8V8ULAEHCVYQSIRG93D29XAQ8KKM4FC#
# Dynamically installed.
FF2VLB3CX43FE7GRYIB3W96MVFUFK7UX5IM6DTS2WL4YR8JS4N27M6DWEM9
# Dynamically installed.
G8A9EF79GM5Z7C2V6IKBQZ64773ZBDCLMWETBCRHBG57634GFVY9K#
# Dynamically installed.
NRDDL7SPI9LDT5PUG8E4MHVA2933VROPSPBIEZ95JLHMH48OC7P8UEFJXNLRGG8W274AHT
# Dynamically installed.

Ok,you succ! 
Sorry ,i forget one thing that you should modify your systerm time  to 2005 year!!

I think ,you could do those better than me.
Best wishes~~

原始链接: http://blog.51testing.com/html/98/64098_itemid_3893.html