Steps to reproduce the issue

Select Cassiopeia template, then select copy template, fill out a new name, then enter. The error then gets thrown.

2 error messages:

Warning
Jlnstaller: :lnstall: File does not exist bcd87\language
Template Install: Could not copy files from the files source.

Error
Error installing template
Unable to install new template from temporary folder.

Expected result

New template as copied

Actual result

Error thrown. No template created or copied

System information (as much as possible)

Additional comments

Version 4.0 Alpha 12
Actual error dialogs attached