You may see an "unsafe" warning when running software without a certificate. We downloaded and tested it on our Windows machine and it worked fine, so it's a bit tricky to pinpoint the exact cause.
Here are some common solutions that might help:
(1) Try deleting the game files you downloaded earlier, and then re-downloading the entire game. This will ensure that you have a clean copy and eliminate any possible file corruption issues.
(2) Double check that the downloaded files have been fully extracted from any ZIP folders. EXE files usually won't run directly from a compressed archive.
If you are still experiencing problems, we recommend that you try the web version (browser version) of the software. We have received 0 reports of the Web Version failing to run.