The script in the application directory only works when called from within this directory like that "./qcad". I suggest below alternative, that can be called from any place, as above and also with an absolute path, eg "/opt/qcad-3.0.0-tp1-prof-linux/qcad":

#!/bin/sh

EXE=${0##*/}
DIR=${0%$EXE}
LD_LIBRARY_PATH=${DIR} ${DIR}/qcad-bin $@

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Can only post anonymously, Peter

#!/bin/sh

DIR=${0%/*}
LD_LIBRARY_PATH="${DIR}" "${DIR}/qcad-bin" $@