readme-Upgrade.txt file states:

To upgrade to CB 1.9 from CB 1.1 or CB 1.2 RC on a Joomla 1.0.x
or Joomla 1.5.x environment you need to follow on of the following:

- EXPERT FTP UPGRADE PROCESS or the
- MANUAL UNINSTALL/INSTALL PROCESS

EXPERT FTP UPGRADE PROCESS:

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NOTE:
----> You will need to download the extra CB 1.9 relevant
cb_expert_files_only_*.tar.gz
file separately from the Free download area on Joomlapolis

Used the search feature on this site as well as browsed the documents, I see no such file It is missing/removed from here?