/afs/urz.uni-heidelberg.de/usr/pci/i77/mctdh...
and
/u/pci/i77/mctdh...
are equivalent. The mctdh programs will convert the long version to the short version if one sets the variables ignore and substi accordingly. (See lines 15-20 of the shell-script $MCTDH_DIR/install/install_mctdh). I.e. for the above example one should set :
ignore="/afs/urz.uni-heidelberg.de/usr"
substi="/u"
The ignore part of a path-name will de replaced by substi.
If you cannot make use of ignore and substi you should unset them. If you (re-)define ignore and substi after you have successfully installed the mctdh-package, just run install_mctdh again, but this time with the -f option. You then may answer all the questions with no, except for the compilation of the source code.