So your Aptoide doesn’t seem to be installing anything. I’d suggest to check whether it’s allowed to do so, by going into the hidden Settings Menu (instructions here) and checking the following settings:
Device Preferences ->
Security & Restrictions ->
Unknown Sources ->
In the Install unknown apps screen, make sure that Aptoide TV is Allowed (slider to the right and in blue).
If you want you can enable other programs such as File Manager to install applications also.
If Aptoide TV was already Allowed (slider to the right and in blue), then we’ll have to do some more troubleshooting. You could try to take it off (Not allowed) for Aptoide TV, back out of the menu one level, then go back into Install unknown apps and Allow it again.