open app from unidentified developer -- Apple instructions not working

From where did you download the app?

I downloaded from here

What I get is an error that states the app is damaged. It is possibly related to Gatekeeper, but nothing you do with Gatekeeper (i.e. those instructions) will open the app. I don't know what is "damaged" about the app, but you can open the jar without issue. However, the program will not run from there as it cannot find it's libraries.

My guess is they need to rewrite their java launcher app to work correctly under High Sierra.

However, their note on the download page seems to indicate they are unwilling to do so. They don't need to pay Apple at all. They just have to write their software correctly.

I downloaded it, opened the .dmg and moved the folder to the applications folder, on start up I get a message that it needs the Legacy java runtime 6 in order to run, but my mac already has that installed, so!

Eau Rouge wrote:

I downloaded it, opened the .dmg and moved the folder to the applications folder, on start up I get a message that it needs the Legacy java runtime 6 in order to run, but my mac already has that installed, so!

I did the same, but had to install Java 6--only install it for testing things on these forums. It got past the Java requirement and presented the damaged app.

I also ran the java app from the command line and it works, but looks horrible--did I mention I hate Java.

I guess it is a possible solution, so here's how you do it:

Copy and Paste this command into Terminal: Note that this will only work if the app folder is named the same.

cd /Applications/Art\ Of\ Illusion\ 3.0.3/;

java -jar /Applications/Art\ Of\ Illusion\ 3.0.3/Art\ Of\ Illusion\ 3.0.3.app/Contents/Resources/Java/ArtOfIllusion.jar

I ran it under Java 9 and it looks better.

You can also create a "command" file to run the app.

Use the same code and save it in a file with a .command extension. It will open in Terminal and run the commands.

A third option is to use Platypus to create a bundled app to run the command file. You don't need to add the command extension. You can use .sh (for shell).

Tell Platypus it is a Bash shell and select your command file as the target.

If you want the AOI icons, right-click on the AOI app and choose show package contents. Open the Resources folder and drag the aoi.icns file onto the icon well in Platypus.

Set the Output to "None" and give the App a name.

Click Create and it will ask you where you want to save the App.

You can even delete the shell file after creating the app as it copies the file into the app bundle.

With this method you can install a current version of Java JDK from Oracle.

Here is a simpler fix.

copy/past this command into Terminal and leave a space after it (don't hit return)

xattr -d com.apple.quarantine

Drag the Art of Illusion.dmg file into the Terminal window from Downloads.

Hit return.

Now, mount the dmg and drag the app folder into your Applications folder.

Try Control-click instead of right-click.