Im getting this NSIS error when installing the obsidian patch. It shows up after verifying the installer.

Says:

The installer your are trying to use is currupted or incomplete.
This could be the result of a damaged disk, a failed download or virus.

You may want to contact the author of this installer to obtain a new copy.

It may be possible to skip this check using the /NCRC command line swich
(not recommended)