If you're using Adobe Creative Cloud and would like to use a previous version of Illustrator or Photoshop, there is an easy way to access previous versions.
First, open your Creative Cloud app, and go to the Apps tab and find the application you'd like to download a previous version for (Photoshop or Illustrator). Once you've found that, click the down arrow beside 'Update' or 'Open'. Then, click 'Manage'.
Once you've clicked 'Manage', click the option for 'Other Versions'.
Once you've clicked 'Other Versions' a list of older versions will come up, and you can choose which one(s) to install.
If multiple versions of an application are installed, an arrow will appear next to it. You can click on the arrow to view or manage currently installed versions.
Once you have the required versions of Illustrator and/or Photoshop installed, you will have to re-install MAPublisher or Geographic Imager to them. You can download MAPublisher here, and Geographic Imager here.