Inside your theme's SandboxSolution folder you will find a .wsp file which you will be using for installing your theme.
- Open your SharePoint Site;
- Click on Settings ⚙️ and then on Site settings;
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Under "Web Designer Galleries", click on Solutions;
Note: If you're not working on your root site this option will not appear.
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Click on Upload Solution;
- Upload the "yourthemename".SPO2013.wsp file. You can find the file by opening your theme's pack and the SandboxSolution folder;
- Click OK;
- Click on "Activate" to activate the theme.
Theme installed! ✅
Set the master page
The final step is to change your current master page to one of the theme's master page.
- Open the Settings menu and click on Site Settings;
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Under Look and Feel, click on Master page.
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Choose the master page you want to apply. Your theme's master pages starts by yourthemename;
4. Click Ok.
Master Page set! ✅