installation failed:
If the installation fails in the middle of the installation, it may be due to the foreign website you are visiting, and some jar packages are not downloaded due to the network speed limit. At this time, you can install it through the domestic website. The method is very simple, just change the download address and repeat the following operations.
之前地址：https://download.eclipse.org/windowbuilder/1.9.2/
更改为： http://mirror.bit.edu.cn/eclipse/windowbuilder/1.9.2/
Download and install (see above for failure problems)
Enter the WindowBuilder version introduction page: https://projects.eclipse.org/projects/tools.windowbuilder to
view the corresponding version number.
I am using eclipse2018.12, so the corresponding version should be 1.9.2
Enter the download page: https://www.eclipse.org/windowbuilder/download.php,
click the link, and select online installation.
Copy the address here.
https://download.eclipse.org/windowbuilder/1.9.2/
Open eclipse-help-Install New Software
select all
