Hello, there might be an issue with your antivirus software.
I found more info about the topic here pix4dmapper.exe File corrupted
Please follow the instructions mentioned in the above post and comment there about your findings so that we can gather all the information about this error message at one post. I will close your post for further comments so that we gather all the information here: pix4dmapper.exe File corrupted
I hope the instructions will help you 