This archive is either in unknown format or damaged

this archive is either in unknown format or damaged
7 zip Download link
www.7-zip.org/
To fix this your damaged rar file.
1. Check your operating system type.
2. Download the 7 zip software from this website www.7-zip.org/
3. Install 7 Zip on your PC.
4. Right-click on the damaged Rar file and select z zip from the drop-down menu.
5. Click on extract here to access your files and folders