This is how you can open your incomplete crdownload files on android devices.

Step 1. Download crdownload file opener on playstore - https://play.google.com/store/apps/details?id=crdownload.file.opener.player

Step 2. Launch the app by clicking on the icon on your android phone

Step 3. Click on "Select crdownload file" button

Step 4. Select your preferred .crdownload files.

Step 5. Thats all, the file would be opened on your phone.