Older Android versions enabled sharing of the main app directory between Locus Map Pro and Locus Map 4. This is no longer possible due to the recent changes in the Android file system - 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