And I cannot figure out how to download it again?!

I have been working on a home renovation plan in SW3D for several months. When I tried to open a file today, I got the message, "no application selected to open this file" [:-/]

It has been a week or two since I needed to open the files. Im baffled and bummed
Has anyone ever experienced this? Thoughts?

Im working on a mac book pro running 10.15.7/Catalina. SH3D is no longer in my application folder. On the Apple Store, when I click on the "Open" button (I purchased several years ago), nothing happens. I tried the Source Force download button but I don't have Java. Am I missing something?

Please Help! Reb thank you in advance!