The Release Notes (readme.html) included with the product installer contains the latest information, including known limitations.
The SQDR Plus Technical Documents on the StarQuest website can provide additional documentation.
In particular, the following technical notes, and others, are available for SQDR Plus:
Troubleshooting Tips for the SQDR Plus Db2 LUW Staging Database
Using SQDR Plus with IBM i IASPs (Independent Auxiliary Storage Pools