as for your last screenshot, it is not clear what throws, the screenshot just shows that the import validation passes with some warnings, however, even with warnings you can still continue the import, just click "Import". if you continue, what happens?
How to unzip? Should I need to download any tool to unzip it? Also it doesn't tell the correct location of corrupted area .
rename your export file extension from .jsrexport to .zip, from example if your file is file.jsrexport rename it to file.zip then you can unzip it with any tool available on your OS for handling zip files.