I am trying to install simmechanics link on my computer using version 3.1.1 on matlab 2009b. Ive downloaded the smlink.r2009b.win32.zip file and the add_addon.m file.

I then typed - install_addon('smlink.r2009b.win32.zip') - and got the following error message:

Installing smlink...
Extracting archive smlink.r2009b.win32.zip to C:\Program Files\MATLAB\R2009b...
??? Error using ==> mkdir
Access is denied.



Error in ==> extractArchive>extractArchiveEntry at 77
   mkdir(parentDir)

Error in ==> extractArchive at 52
         files = extractArchiveEntry( ...

Error in ==> unzip at 92
files = extractArchive(outputDir, api, mfilename);

Error in ==> install_addon at 37
unzipped_files = unzip(zip_file, install_dir);