Use a PC tool like or CMD Injector to push the files to your device.
While many modern apps (like WhatsApp) no longer work on Windows Phone 8.1, you can still find legacy versions of useful software on sites like Mobyware : skachat programmu na liumiia 630
: You can download .xap files to a computer, move them to a memory card, and then select "Install local apps" from the three-dot menu in the phone's Store app (though this may fail if the app requires online validation). Popular Apps for Lumia 630 Use a PC tool like or CMD Injector
: This is currently the most recommended method. It allows you to browse and install apps from specialized community repositories directly to your phone. Manual Sideloading (.XAP / .APPX) : Enable Developer Mode in your phone's settings. It allows you to browse and install apps
Find application files (in .xap or .appx format) on community forums like 4PDA or dedicated archives.