How to repair a damaged file .cdr

Good day. The following problem has occurred: the files that were restored after deletion are corrupted .cdr. Page thumbnails are visible (but not all), and the files themselves are not opened. Please tell me how to fix it. I tried using Recovery Toolbox for CorelDraw, but without a key the recovered files are not saved. Perhaps there is some alternative???....Most of the practice report is in these documents, cat. I should have passed yesterday!!! SOS, please help...

SolidworksEdrawings