Flash CS6 - Do I really need Flash CS6 for my site?

Hi all,

Newbie here so be gentle lol.

I inherited a Flash site today that was originally designed using Macromedia. The admin of the site tells me he doesn't know flash well so every time he made a change to the site he essentially has upload a whole new copy of the site to the hosting site.

Here is my question:

If I take on supporting this site is there an alternative that anyone knows of to work better and smarter in supporting a flash site other than spending $700 for Adobe Flash CS6?

Being new to Flash support I want to work smart and not buy the most expensive tools out there. Can I use Dreamweaver or something else to edit/modify the existing site that was built in Macromedia?

I sincerely appreciate any and all assistance and advise on the best approach. I simply need to be able to open the existing site files for editing.