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Dear Kavya,
I would trust the authors of such programs (ccp4-, phenix-,
shelx-collection et al.) to only release new versions of their programs
if they believe that version is an improvement over the previous version
;-) and generally use the latest
Dear Kavya
In principle you should be able to use newer version for old pdb file unless
you have pdb v2 namings for DNA/RNA etc.
New version of ccp4 has more dicitionary elements (1 or so). Older version
was compiled for 3000. That is the reason why old version does not work with
new
