adb: failed to install file.apk: Failure [INSTALL_FAILED_OLDER_SDK: Failed parse during installPackageLI: /data/app/vmdl5610533.tmp/base.apk (at Binary XML file line #24): Requires newer sdk version #26 (current version is #25)] PS C:\adb\platform-tools_r30.0.5-windows\platform-tools>
You will need a device that has Android 8 to run this app, find a version that works for Andoird 7.1 or update your MECOOL.