* moved to correct section
Unfortunately Construct Classic always did have some very bad glitches, which is why it was made redundant years ago.
Losing work is is always a possibility if you don't make regular back-ups. You can't really blame anyone else for losing work.
Only thing I can suggest is to upload your.cap and if any of the old CC regulars see this, they may be able to help, but it would be along shot, unfortunately.