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v5 to v6 compiler error

My original program was coded in the older version 5 and I recently upgraded the software to v6.

I am trying to run those codes but an error "16000: objects files have  incompatible formats" pops up. I presume that the code works on an older compiler version which is not available in v6.

I downloaded all versions of compilers and changed the build settings too. Still doesn't seem to work.

Any suggestions?