This type of unusual errors can be solved manually empty the cache of the Mac App Store and then re-download the application from the Mac App Store.
Accessing caches temporary download from the Mac App Store
Just in case, make sure you have a backup of your Mac before starting this process.
Exit the Mac App Store
Open the terminal, located in / Applications / Utilities / and type the following command: $ TMPDIR open ../ C / com.apple.appstore /
- The important thing is not to eliminate or adjust any files outside this directory. At the end closes the folder com.apple.applestore
- Relaunches the Mac App Store