'fix' download links: point to software.dlr.de now
'fix' download links: point to software.dlr.de now

KnowledgeFinder/knowledgefinder.github.io,DLR-SC/rce-website,DLR-SC/rce-website,KnowledgeFinder/knowledgefinder.github.io,DLR-SC/rce-website,DLR-SC/rce-website,DLR-SC/rce-website,KnowledgeFinder/knowledgefinder.github.io,KnowledgeFinder/knowledgefinder.github.io,KnowledgeFinder/knowledgefinder.github.io