For AutoCAD 2013 and related vertical products, Right-click on the AcDgnLS.dbx file
in your product installation folder (for example C:Program FilesAutodeskAutoCAD
2013) and check the version to see if it is 19.0.55.0 or 19.1.18.0. If it is either of
those two, replace the file with the one from the hotfix (otherwise, you do not need
to replace this file). If the file version test is valid, rename the file to AcDgnLS.bak.
5. Copy the extracted files from step 3 (from the x86 or x64 sub-folder, depending on
whether you have 32-bit or 64-bit software) to your product installation folder (for
the AcDgnLS.dbx file, see note in step 4 above)