直接下载安装会报如下错误：

There was an unexpected error executing Import ISE Virtual Appliance

解决方案

1.阅读xilinx手册后发现，需要先安装Oracle VirtualBox，安装步骤参考链接2
2.安装完Oracle VitualBox之后,再次安装ISE即可
3.时间设置
{{uploading-image-158671.png(uploading...)}}

xilinx官方的手册：https://www.xilinx.com/content/dam/xilinx/support/documentation/sw_manuals/xilinx14_7/ug1227-ise-vm-windows10.pdf
链接2virtualbox安装：https://www.shaileshjha.com/how-to-install-oracle-vm-virtualbox-5-in-windows-10/