The aptoide store is just like any other store with all the apps available on the Google play store. You can even download paid apps for free . There is no malicious threat to download the apps from the aptoide store.
To download aptoide follow this link-
Here is an example of the famous game GTA San Andreas available on the aptoide store for free on the aptoide store , while being a paid game on the Google play store.
Do not even worry of the updates . The aptoide store does your update just the way Google play store does . Just type the app name in the search bar and there you go . Have it all.