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I really wanna play this game but I'm on mac and when I tried to open the file it said it can't open 

Hi there!

What is the specific error message you are getting?

There are some other posts in the comments from Mac users with similar issues. They've posted some solutions that worked for them, so they might help you!

The specific error I'm getting is that it says, "this program can't open" or something like that, and you can only press okay; it doesn't let you see what's wrong with it. I also think it isn't a security issue because those can easily be solved in privacy and security settings. 

Another user suggested this fix: 

"I usually have to drag the downloaded app into "Applications," then control+click the icon. It'll say it doesn't trust the origin of the file, but there should be an 'open' option anyways. It might take a couple tries to get it to show, but it's always worked for me so long as it's in "Applications" and not "Downloads.""

If that doesn't work, try installing the itchio app and download the demo through that.

I found a fix as I was also having the same issue! 

1. Move the application to your Applications folder.

2. Open Terminal.

3. Paste 

sudo chmod +x /Applications/RadiantsDemov2.1_Mac.app/Contents/MacOS/The\ Radiants\ Alpha\ Build

then press Return/Enter.

4. Enter your password when prompted and press Return again.

5. Open the Radiants application.

Thanks so much for sharing! It's always hard for me to test because I don't own a Mac. 

I really need to make a FAQ with this info :)

(+1)

I actually work in development and have done QA in the past professionally, so let me know if I can ever help out for free! :D