xsct is part of SDK since version 2015.1...
The reference guide says a standalone install is also possible: https://www.xilinx.com/support/documentation/sw_manuals/xilinx2018_3/ug1208-xsct-reference-guide.pdf (Page 9)
My questions are:
1) is this standalone install of XSCT possible for Xilinx ISE 14.7 ?
2) where to find the realated Xilinx_SDK__Lin64.BIN for download?
XSCT is not available for ISE 14.7, as it was released as part of Vivado related SDK. On ISE timeframe the EDK tools used to include XMD tool.
The SDK installer can be downloaded through the Xilinx website.