Xilinx design tools are designed to be installed in a directory under ROOT (typically C:\Xilinx). The installer normally presents this option when installing to a local driver.
To work around this issue, either specify a UNC path (for example, \\network_loc\Xilinx\) or define your target installation directory as \Xilinx under the network mount point (For example: N:\Xilinx).
Note: You are not able to browse to the remote
mapped drives using the Xilinx installer. You
need to manually type in your installation path which contains a mapped network
drive.