If it's only the cpsp file that is damaged, you are lucky! Just copy the cpsp file from another project using the same CpStudio version and adapt its name. (The real project content is in the Engineering_Data.xml file.)
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In the folder Opcon\Images.OCP (Control plus V1) or Nexeed\Images.NXA (Control plus V2) on the image stick, there is a file with extension .cfg. You can open it with a text editor and see what image versions are on the stick.
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