现象
可以做原理图仿真，但版图仿真时提示许可证错误
License check returned: Momentum Object
License file signature is invalid
Possible Causes:
1. The license file was altered.
2. The license file was created with an invalid key.
Troubleshooting Tips:
1. Do not alter the license files unless directed to do so by Agilent tech support.
2. Obtain a valid license file and restart the license wizard.
解决办法
进入ADS安装目录，例如Keysight\ADS2020_update1.0\Momentum，下面有两个文件夹，一个新一些，一个老一些，比如2020.00和2020.10，将老文件夹下的内容复制到新文件夹下并覆盖，即可解决问题。
