Older Android versions enabled sharing of the main app directory between Locus Map 4 and Locus Map Pro. This is no longer possible, each app can use only its own private folder.

• Install and initialize the update of one of the Locuses
• Accept the offer to change its main directory:
  
• the app detects the other one and warns of the possible loss of access to the data of the other app after the transfer
  
• select one of the available private folders into which the data will be transferred
• after the transfer, restart the updated app