BaseElements is always built using the latest version of FileMaker Pro. So the requirements for using BaseElements are always based on the requirements of the current version of FileMaker Pro.
Minimum FMP version required
|Minimum DDR Version||Maximum DDR Version|
Database Design Report
Firstly you will need a copy of FileMaker Pro Advanced to generate the Database Design Report. At a minimum this will need to be FileMaker Pro Advanced 7 or later. BaseElements won't import a DDR from version 6 or earlier.
Use whatever version of the FMPA that you're using to develop the files in, it doesn't need to be the latest version of FMPA or match the version of BaseElements, as long as it is late enough to cover all of the features you've used in your solution. ( In other words don't develop your solution using FMP 10 with v10 only features but run the DDR with 7, your v10 features won't be included in the report. )
Once you've generated the DDR report you can import that into BaseElements. You can run BaseElements in a different version of FileMaker than you generated the DDR.