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but i don't know where to get the library

Here's how to do it on mac: first you have to download adobe air, install it (ignore any error messages), type this in the terminal: 

sudo xattr -r -d com.apple.quarantine /Library/Frameworks/Adobe\ AIR.framework

download alternativaEditor and un-zip it (https://en.tankiwiki.com/images/en/9/94/AlternativaEditor.zip),

then go to the applications folder, open the utilities folder, right click Adobe AIR Application Installer(may or may not have the .app extension) and press Show Package Contents,  navigate to Contents/MacOS/Adobe AIR Application Installer, then drag that file into terminal and after that, type (put a space after the file path)

 -ignoreExpiredCertificateTimestamp  and hit enter, and then search for AlternativaEditor-light.air, and press enter.