Do you have a different developer signature on your new pc?
Viewing post in Android apk update 23.11.07 comments
Unfortunately no, I am not a developer, I have had issues on the receiving end of apk updates not having matching signatures. https://developer.android.com/studio/publish/app-signing
Hopefully this link has the information you need to find it. It sounds like you need to manually set the apk signature so if you don't know where it is it might have auto generated one which would not match the signature on your previous pc.