The web part is provided in 3 different packaging, all following Microsoft guidelines:

For Classic Experience:

• Add-in, for tenants with a configured App Store/Catalog.
• WSP, no-code sandbox solution, (recommended) whenever sandbox is available.

For Modern Experience:

• SPFx, SharePoint Modern Pages.

For Microsoft Teams:

• SPFx, Microsoft Teams.

After unzipping your web part package, you will find three folders, a app folder, a wsp, and a SPFx folder. You will be using one of these folders to install the web part.

But first, let's check out what is inside the package.

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app 📁

└── BT _x.x.x.x.app

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spfx 📁

└── SP2019

└────── BT _x.x.x.x.sppkg

└── Office365

└────── BT_* MSTeams.zip

└────── BT* _x.x.x.x.sppkg

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wsp (Recommended) 📁

└── BT _x.x.x.x.wsp

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└── README.md