Thats pretty strange because the program still works correct and available to do some things like unwrap and texturing. So I even can export model WHY I can’t save current state of the project if it sill works? I dont have any good thoughts about this decision.
And yes, I clean the temp files from disk C, the Reality Capture always occups all space and doesnt provide ability to move Temp folder to another disk. So I always get message “Not enough disk space”. Thank you Reality Capture, good message after 3 hours of calalculations.
And it’s too much to occups 50 GB to every little project with 2000 pictures. 
UPD: I found how to change path https://support.capturingreality.com/hc/en-us/articles/115001484852-Cache-Temp-folder