Panic's Developer ColorPicker (v1.5.4) does not work in macOS Catalina or macOS BigSur. This is due to enforcement of code-signing. Until Panic releases a newer version that supports Catalina/BigSur, below is the workaround.
You need a Developer Account. This could be a free account. Refer: https://9to5mac.com/2016/03/27/how-to-create-free-apple-developer-account-sideload-apps/
https://panic.com/blog/developer-color-picker-1-5/
Unzip and copy DeveloperColorPicker.colorPicker
to ~/Library/ColorPickers
Code sign
security find-identity -p codesigning
Verify whether the above command lists at least one valid identity. Among the identities copy the identity name with which you would like to sign. Identity name will be a text in the format "Mac Developer: [YOUR_EMAIL] ([YOUR TEAM])"
cd ~/Library/ColorPickers
codesign --force --sign "Mac Developer: [YOUR_EMAIL] ([YOUR TEAM])" ./DeveloperColorPicker.colorPicker
If you do get the error ./DeveloperColorPicker.colorPicker: resource fork, Finder information, or similar detritus not allowed
,
execute the below command and re-try code signing.
xattr -cr ./DeveloperColorPicker.colorPicker
Hi @Kiran-B
Thank you. First I found the error, though I never did ID what the number crossed to. It was caused by my failure to clear the check mark on the "Basic Constraints Extension” screen. I had to slow the video down to 25% speed to catch it. ;-( Which is not to mean that I know what an extended basic constraint is.
Second, in my research I came across 9to5Mac's How-To: Create a free Apple developer account for sideloading apps that seemed very close to what I wanted to do. I put 2 and 2 together and ended up with a working Developer Color Picker. I extended the approach to another color picker (RCWebColorPicker) but it only worked on my High Sierra VM. It's probably 32-bit software but I don't know how to tell when it's not an app. I can't deploy either one, but wasn't my goal.
Thank you for your guidance, and may I be the first to wish you a happy holidays.
...Mick