My mac OS version is Yosemite 10.10.5.
Downloaded trial version dmg file from http://download.haskellformac.com/
And then, tried to open the downloaded file but just raised warning.
Translated into English
```
Warning
These disk images cannot be open.
image | reason
Haskell—FunctionalProgrammingLab.dmg | The image is broken
```
It does not suppose to me that they may be enough for you to resolve.
How can I capture more detailed logs?
Hello, I am sorry that you are having trouble with the disk image.
Could you please download it again? I assume that it was corrupted during downloading. The image on the website definitely is working.
Please let me know whether re-downloading solves your problem. Thanks!
I downloaded with Chrome it again but the same warning was thrown.
In addition, I did with Firefox but it was not solved.
Here is the checksums of dmg files. Could you check them?
~/Downloads openssl sha1 Haskell—FunctionalProgrammingLab.dmg
SHA1(Haskell—FunctionalProgrammingLab.dmg)= 62186500a487a71ba1ea95ae2d4b0457f40434da
~/Downloads ᐅ openssl md5 Haskell—FunctionalProgrammingLab.dmg
MD5(Haskell—FunctionalProgrammingLab.dmg)= df8f6af2c6e9c47771d325ce1947a8b0
This is strange. The checksum is matching. I just verified that I can indeed download and mount the DMG on my Mac running macOS 10.13.1. It works without any problems.
Sorry, I just saw that you wrote at the top of your post that you are running Yosemite. That is the problem. I am using a compression scheme that was only introduced in macOS 10.11 (El Capitan).
I switched to this scheme, because the app also requires at least El Capitan to run. (I am sorry, but there are some problems on Yosemite with Cocoa that make it difficult to support.)
I am very sorry that I didn't notice this right away when I read your post. Please accept my apologies.
Okay, I am going to retry to install after upgrading macOS.
Thank you for your supporting.
p.s.
Please document the requirements to install if not