The article below provides detailed guidance on 3 ways to fix corrupted .rar files: Fix rar file with built-in tool in Winrar; Using Keep broken files option or with Recovery Toolbox for Rar software
Method 1: Fix rar file with built-in tool in Winrar
Step 1: Open Winrar software by selecting Start -> WinRAR.

Step 2: When the dialog box appears, select the path to the corrupted archive file (as shown in the illustration).

Step 3: Go to the Tools tab -> Repair archive.

Step 4: Choose the folder to save the repaired file and select the file format to save .rar or .zip.

Step 5: After successfully recovering the data, click Close.

After successfully recovering the data, you return to the folder where the recovered data file is saved. The file name is usually rebuild + the original file name.

Method 2: Use the Keep broken files option when extracting
Note: This method only applies to music or video files, or a large file containing multiple smaller files. This method cannot be used for compressed files containing setup installation files
Step 1: Right-click on the file to extract -> Extract files.

Step 2: Check Keep broken files -> OK.

After successfully extracting, reopen the folder where the results are saved:

Method 3: Fix rar file with Recovery Toolbox for Rar software
You can use Recovery Toolbox for Rar software to fix errors.
1. Install Recovery Toolbox for Rar software
Step 1: Visit the website: https://rar.recoverytoolbox.com/ and select Download to download the software to your computer.

Step 2: After downloading, proceed to install the software -> click Run to start the installation process.

Then select Next.

Step 3: Check I accept the agreement -> Next.

Step 4: Continue selecting Next.

Step 5: Press Next to complete.

You have now completed the software installation process.
2. Utilize software to fix errors.
Step 1: Click to browse for the path to the file needing error correction (as shown in the illustration).

Step 2: Select Open to open the file.

Step 3: Click Next to begin the extraction process.

Step 4: If your file is too large, please be patient and wait for Recovery Toolbox for RAR to fix it.

Step 5: Check the box for Next.

Step 6: Choose the path to save the file -> Next.

The file after error recovery is appended with repair at the main file name.
Here are some basic ways to fix .rar file extraction errors. If none of these methods work, double-check your downloaded data for any missing files or if it's just a partial software bundle.
Wishing you all success!