.APK File are specific extension compatible with Android Device and can only be opened and installed on Android based device.
Install .APK File On Android Device Using SD Card
Here is how i used to install .APK File on my device after downloading it into my computer and then using the SD Card.
First of all download the .APK file into your computer. I will recommend downloading it to Desktop or/if any other location which in your easy access.
Now transfer that file to your SD Card using data cable and connecting the phone or using Card reader or any other mean to connect the card directly. Place the file in your easy access, so that you can reach it easily.
After that disconnect the device or/if you are using a card reader disconnect it and insert the card back into the Android device.
Now open the file on your Android device using the file explorer(many file explorers are available in the market), as soon as you open the file it will prompt you for the installation to begin. Install that file and its done. Now you can enjoy that game or app.
Install .APK File Directly On Android Device
You can also download .APK File directly on your android device, but for this you need to have a WiFi or Data Connection. I will recommend having an active WiFi connection. If you are using a network data connection then make sure you have enough data allowance remaining or enough credit in your account.
This way of installing .APK File on your Android Device is easy and saves time as well.
Now open the site from which you want to download the file using the mirror link. Now click on the mirror link and give the permission to install the file (After reading the permission carefully)
This is easiest way if mirror link and high speed Wifi connection is available.
Install .APK File On Android Device Using Drop Box
DropBox accounts are the well know accounts for uploading and sync your computer files and online account. Same folder can be sync with your device as well. This is one of the easiest way to install .APK file on your Android device.
Get one DropBox Account, Sync with your computer and put .APK Files in the folder created (on your computer) for DropBox Files. Also Install DropBox application on your device and log into the account.
Now Open the .APK Files, read the permission and then install the file. DONE
Choose one of the possible ways that suits you to install the .APK File on your Android device. The basic process id that you open the .APK on your device, read the permission and Install the app.
If you have any questions, Please leave a comment and i will get back to you with an answer.