Download Bulkr installer here (bulkr-v1.8.air will be downloaded)
Temporarily change your computer's date to 30th December 2020
If you are on these versions of Mac: OSX Catalina or OSX Big Sur please follow these steps:
Open Terminal app from your Application folder
Copy/paste the following in the terminal window (you may need to enter your mac password): sudo xattr -r -d com.apple.quarantine /Library/Frameworks/Adobe\ AIR.framework