I believe you have to decompile monopoly go version 1.9.5
And change the version of 1.9.5 to 1.11
I managed to get into the apk files and in the manifest is this;
<manifest xmlns:amazon="http://schemas.amazon.com/apk/res/android" xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="20661" android:versionName="1.11.5" android:installLocation="preferExternal" android:compileSdkVersion="33" android:compileSdkVersionCodename="13" package="com.scopely.monopolygo" platformBuildVersionCode="33" platformBuildVersionName="13">
I may be wrong but you might have to replace these lines in version 1.9.5;
android:versionCode="20661" android:versionName="1.11.5"
I've not attempted to downgrade an app this way and I'm working away so I only have my phone to mess with so if anyone else could mess with this and see if it works be great.