Just upgraded to Big Sur and have the same issue, but the codesign does not work. I get the xcrun error and not sure how to fix it. I have run this as the user, which fails, but also after sudo to root. As a standard user: user$ codesign --force --deep --sign - /Applications/HP\ Easy\ Scan.app /Applications/HP Easy Scan.app: replacing existing signature xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun /Applications/HP Easy Scan.app: the codesign_allocate helper tool cannot be found or used In subcomponent: /Applications/HP Easy Scan.app/Contents/Frameworks/HPScanCaptureMgr.framework As root: root# codesign --force --deep --sign - /Applications/HP\ Easy\ Scan.app /Applications/HP Easy Scan.app: replacing existing signature xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun /Applications/HP Easy Scan.app: the codesign_allocate helper tool cannot be found or used In subcomponent: /Applications/HP Easy Scan.app/Contents/Frameworks/HPScanCaptureMgr.framework I have even tried as root on the HP Utilitiy app, but still have the same problem. root# codesign --force --deep --sign - /Applications/Hewlett-Packard/HP\ Utility.app /Applications/Hewlett-Packard/HP Utility.app: replacing existing signature xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun /Applications/Hewlett-Packard/HP Utility.app: the codesign_allocate helper tool cannot be found or used In subcomponent: /Library/Printers/hp/Utilities/HP Utility.app/Contents/Frameworks/HSDCommonLib.framework Any advice?