When only a single app is installed on the device (the other Locus is not installed), the app update goes through the most simple and straightforward process:

• one app (Locus Map 4.4.x or Locus Map Pro 3.55.x) is installed
• download and install Locus Map 4.5 or Locus Map Pro 3.56
• during the app initialization, you are notified of the app directory /Locus/ stored in the unsupported part of the internal storage:
  
• after accepting it, you can select the private folder into which the data will be transferred - either in the internal storage or on the external SD card
• Locus smoothly transfers all the original data into its private folder
• the process may take a few minutes depending on the size of your data
• after the app restarts, all is done and working as before

• you can go on using the app as before
• but you are notified of the app data transfer at each next start of the app
• you can move the original data any time also from the app main menu:
  
  or from settings > miscellaneous > default directory.