Dear All,
From some months ago, any installation of any app take very very long time and in some cases don't install even after un-installing previous one.
and in all cases, I un-install previous version before re-installing.
Any explanation please
1, 2. no i send apk file from PC to mobile (normal copy, mobile seem like flash memory),
3. the problem only with my generated apk (from B4A), the installation become asking to approve that the app not from play-store and sure I grant that.