sideload

The English word “sideload” has 2 meanings listed here.

verb

To transfer data between two local devices, rather than to or from a remote device.
To install an app on a mobile device by using any app store that doesn't come preinstalled like Google Play or Apple App Store. Or installing an app from an installation package. (.apk/.ipa)

From side + load, modelled on upload and download.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.