
Hi @Xiaoliang GENG,
As to the official WebView2 Runtime download page, only the latest 2 versions are provided as the fixed version. However, you are still able to find older versions if they're archived elsewhere. For example, this repository has some archived WebView2 Runtimes, including 109.0.1518.78.
Note: Microsoft is providing this information as a convenience to you. The sites/repositories are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
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Best Regards,
Shijie Li