4GL/SQL 4.13 Compatibilities

Dear All, I have been off this list for a while so please forgive me if this has already been discussed. We have recently received a copy of I4GL and ISQL 4.13, and tried installing it on one of our sites. Unfortunately, with any software that was compiled with a previous (4.0/4.1) version of 4GL, we get the error 'Please install a 4GL Runtime instance and try again' I then had a look through the TOOLREL_4.1 file, and discovered that the libraries have been moved and that the methods of compilation are changing. My question is, 'What do I have to do to make my old programs work with 4GL/SQL 4.13 ? Do I have to re-compile everything with 4.13 ?' Would it be possible to get some sort of updated table showing compatibilities, since I cannot find out where exactly the cutoff is (IE: Where is the compatibility cutoff between 4.01, 4.1, 4.11, 4.12, 4.13 and engines 5,6 and 7 ?) Thanks in advance, Richard Ridley DHL Asia Pacific