It has been confirmed that Carthage cannot be installed.

[Akio Itaya]

18:07:10  akkeylab@AKIOs-Mac-Pro  ~/Dev…ent/AKProcessIndicator   master 0.0.3  carthage update --platform iOS
*** Fetching AKProcessIndicator

There was no further processing.

[Akio Itaya]

** 19:19:09  akkeylab@AKIOs-Mac-Pro  ~/Dev…ent/AKProcessIndicator   master 0.0.3  carthage build --no-skip-current
*** xcodebuild output can be found in /var/folders/pd/my3ty6b14q36tjltyp7ss3v00000gn/T/carthage-xcodebuild.Arzqz0.log
*** Skipped downloading AKProcessIndicator.framework binary due to the error:
	"Bad credentials"
*** Skipped building AKProcessIndicator due to the error:
Dependency "AKProcessIndicator" has no shared framework schemes

If you believe this to be an error, please file an issue with the maintainers at https://github.com/AkkeyLab/AKProcessIndicator/issues/new
*** Building scheme "AKProcessIndicator" in AKProcessIndicator.xcodeproj**

[Akio Itaya]

This has not been resolved yet.