“An error occurred while collecting items to be installed” is the default message when installing software on a Mac. The error is caused by an unknown issue, which is a good thing to know as it may help you to correct the problem. In some cases, a software installation cannot connect to a library, which can lead to an error message. The following steps can help you solve this problem. To fix the error, simply add the library address that was displayed in the error message.
An Error Occurred While Collecting Items to Be Installed