Can't Afford Vectorworks update to work with new OS X ElCapitan

[RexBradfield]

I have used this program since MiniCad Version 1.0.  Used it because it worked on Macintosh Computers.  I was sick of "/" and"*" commands.  I am a 74 year old Licensed Professional Engineer and Licensed Professional Land Surveyor.  Have used this program to design all kinds of engineering designs, including 100 lot subdivisions (by myself) and tens of thousands of Survey Plats. I bought Vectorworks 2008 and have used it since new.  But it requires OS X 10.7 or less.  So I have not updated my OS X operating systems just to keep using my Vectorworks because I could not afford the new program.  The 2008 has Renderworks, Landmark, Architect and Fundamentals. Now I have had to update my OS X to ElCapitan because my internet browsers will not be supported by OS X 10.7.5.  Does anyone have a different Vectorworks program that works with ElCapitan?  Otherwise, I am out of business. I just cannot afford the new programs.  I have stood by this product for nearly 37 years.  Please help.