I don't want to pick up the previous scorer's match due to error on the upload:
Go to file>open match and un-tick 'download latest from server' you should be able to carry on live scoring without picking up the last sync from the previous scorer to Play-Cricket.
I want to take over as Live Scorer from the last sync:
Click on the Live Scoring Sync option in the bottom right hand corner
Follow the prompts and accept.