Once installed, go to the Google Play Store and turn off auto-updates for Pinterest so it doesn't overwrite your version.
Once you find a working version, do not lose it. Here is how to extract the APK from your phone for future use: Pinterest 11.13.0 APK Older Versions for Android
If Pinterest 11.13.0 stops working tomorrow, here are three open-source clients that mimic the old layout: Once installed, go to the Google Play Store
Then, one day, the app refused to load. A server-side change. Pinterest had finally deprecated the API that 11.13.0 relied on. Pinterest 11.13.0 APK Older Versions for Android