dreamweaver crashing

Your latest Dreamweaver download doesn’t work.   It wont allow me to install any of my extensions ( It says "file is corrupt" on every extension when i use either ZXP installer or Anastasiys ).  However , when I roll back to the previous version of Dreamweaver it allows me to install all my extensions with no problem ( proving there is no issue with any extension ) - but is unreliable and crashes whenever I open a PHP page. This has never happened before until recently and the pages in question have been working for years,  Please can you help me