Download application zip file relevant to your operating system:
If you are using 64-bit Windows OS, download: whatsapp-jpeg-repair-win-x64-v2.2.1.zip
If you are using 32-bit Windows OS, download: whatsapp-jpeg-repair-win32-v2.2.1.zip
If you are using MacOS or Linux, download: whatsapp-jpeg-repair-macos-x86-v2.2.1.zip.