I would like to install Locus Map 4 or Pro from Google Play, but it either cannot be installed at all or the installation is not successfully finished.

There may be several reasons for this. In the first place, it is important what you see on the app page at Google Play Store before the installation. If Device is not compatible or Install:

Locus Map is compatible with almost all devices running the Android operation system 5 and newer. If you can not install it due to incompatibility, please contact us via email locus.map@asamm.com and inform us about the type of your device.

If you tap (click) on the Install button, yet the installation does not start, Google Play will probably notify you about the error number. In this case, it is a temporary error on Google Play and the following procedure may help:

• Delete the temporary memory of the Google Play application (your device menu > Settings > Applications > Google Play Store > Clear data)
• Uninstall the older version of Locus
• Restart the device
• Install the application from Google Play again

It may happen that after tapping Install, the installation begins but in a short while it stops with the error number again. This is probably an error on Google Play's side. In this case, follow the same procedure mentioned above.

Solution

• With help of your phone file manager, find /Android/data directory
• Find package name of Locus application
  • Locus Map 4 menion.android.locus
  • Locus Map Classic menion.android.locus.pro
• Delete package name file
• Try to install Locus application again

This error occurs usually on some Xiaomi devices, e.g. Redmi 1S. Sometimes the installation does not execute without any reason or error message, sometimes the built-in Xiaomi antivirus app flags Locus as infected and the installation is aborted. Of course Locus Map contains no viruses

Solution

Xiaomi suggests the following procedure (works only in 90% cases):

1. deactivate the antivirus app (Optimization center > Antivirus > settings > uncheck installation monitoring)
2. go to Applications > Security Guard and wipe all app data
3. install Locus Map
4. activate the antivirus app. Beware! After the automatic update, the Security Guard uninstalls Locus Map without warning.

Another method:

1. go to Settings > Privacy > Device administration > uncheck Verify apps
2. re-install Locus Map

Method for rooted devices:

1. use Titanium backup
2. backup the com.securitycore.miui_t1.0
3. uninstall com.securitycore.miui_t1.0
4. download and install Locus from Google Play store

According to our users' experience a few other ways work as well:

• factory reset of the device
• re-installation of Google Play Store application
• removing Google account and adding it back

This error is concerning Xiaomi again but this has nothing to do with Play Store. Error -26 is related to MIUI's package manager and translates to INSTALL_FAILED_SYSTEM_INCOMPATIBLE. So, it is MIUI who is preventing the install. Somehow MIUI thinks that the apk is incompatible.

Solution

• try to downgrade your MIUI to the version that did not block Locus Map installation
• block automatic updating of your MIUI
• wait for a new version that hopefully will be fixed