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HDL's and logic cells!
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By thebecwar
Xilinx has made it abundantly clear that they have no intention to support the Spartan 6 going forward. The toolchain that you have to install in order to make the Mojo IDE build your project is not supported. The 64 bit version of the toolchain doesn't work on Win 10 at all. (It may work for you. YMMV.)

To make it work, here's what I did:
  1. After downloading the Xilinx ISE installer and un-taring it (7-Zip is your friend) do not use the main installer. Go to the unpacked files, and in the bin\nt folder you'll find the 32-bit-only installer (xsetup.exe). Install using that.
  2. After the installer completes, and you've installed your license per the Mojo instructions, you need to make a fake 64 bit install, so the Mojo IDE can find the executables. To do that:
    • Copy C:\Xilinx\14.7\ISE_DS\ISE\bin\nt to C:\Xilinx\14.7\ISE_DS\ISE\bin\nt64
    • Copy C:\Xilinx\14.7\ISE_DS\ISE\lib\nt to C:\Xilinx\14.7\ISE_DS\ISE\lib\nt64
    • Copy C:\Xilinx\14.7\ISE_DS\EDK\bin\nt to C:\Xilinx\14.7\ISE_DS\EDK\bin\nt
    • Copy C:\Xilinx\14.7\ISE_DS\EDK\lib\nt to C:\Xilinx\14.7\ISE_DS\EDK\lib\nt
  3. Run the Mojo IDE and build your project. It will complain about the fact that Mojo isn't passing the -m32 flag to the command line, but it will build.
Good luck. Maybe if we're all lucky, we'll see some affordable Spartan 7 boards come out before Xilinx abandons those too.