This is forked version of cordova-plugin-passbook. Due to naming difference between package name and plugin name, there were various issues with cordova installation which are now fixed with common name cordova-plugin-passbook-new.
There was also a bug #10 on github which breaks browser history, which is now fixed with commenting code as per mentioned in the issue itself.
I don't recommend downloading .pkpass file using Passbook.downloadPass() function as it does not send cookies or any headers. Instead download .pkpass file using axios or fetch HTTP API, save it on the device and open with passbook.addPass(file) where file is local device path to the file.
cordova plugin add cordova-plugin-passbook-new