File not found or invalid sketchup for school

Was working on my “dream house” file this morning to release to the students as an assignment. I’ve got about 8 hours into the project (I am still learning as well).
The file glitched and the program said it sent a note to the team (or something like that) and now the file is not found or invalid. I have contacted the district’s support team but I need to get this file back and quickly. Am I screwed here? Should I just start builing another project to use as an example?
Any help if appreciated