It was something else, the exact name for it was Rfoil
I found some info about it
here is a link to forum, at the bottom of this page, there is a link but I can't find that software there SourceForge.net: Topic: QFLR5 vs XFLR5 vs Wind Tunnelthomas-xyz said:Rfoil is a imroved Xfoil made at Delft.
The improved Cl_max and stall predictions from Rfoil could really improve XFLR5.
It seems that you should ask them about a free copy.