Hi Zaharin,
Have you tried uninstalling previous versions of LEAP before installing the new version? If this does not work, try downloading another copy of the
setup.exe file in case it was not downloaded properly the first time. (Download from here:
https://www.energycommunity.org/default.asp?action=download)
Hopefully this helps, but please let us know if you continue to receive an error.
Best,
Emily