I receive .ai art-related files (Adobe Illustrator) by art designers at times and I have been using AI Viewer (Free version) to view them and it has been working fine.
When I tried to open the most recent .ai file in AI Viewer, it showed blank.
When I explained the situation to the art designer, he asked me the following question:
"which version of Adobe Illustrator or CorelDraw do you use".
I like to buy either Adobe Illustrator or CorelDraw for the purpose of opening & viewing .ai files.
Which product and version should I buy?