There is a new sRNAtoolbox version! You can find it here

RNA central parser:

This parser extracts the non-coding sequences of a given species or taxonomy level from the RNA central database version 2 (February 2015) ( ) and prepares the sRNAbench format libraries.

Test with: Hordeum vulgare

If you use this data please cite: The RNAcentral Consortium (2014) RNAcentral: an international database of ncRNA sequences. doi: 10.1093/nar/gku991