If you want to use the new SharePoint app model instead of the old Sandboxed model to install the web parts in your website, then you are in the right place.
Let's get started:
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Open your SharePoint Admin Center, and choose apps from the left-side pane;
If you can’t find the apps button, look for add-ins.
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Choose the app catalog option;
If an app catalog already exists, you will be redirected to the corresponding site collection and you can skip to step 6.
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Select the checkbox to create a new catalog site and click Ok;
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Create a new site collection;
It's recommended to have the word “catalog” somewhere in the name of your new site collection.
You will install the add-ins in this site collection, but they can be used in any other site collection.
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On the catalog site collection, click on the gear icon, in the suite bar, and select Site Contents;
- On the site contents page select Apps for SharePoint.
- Click on the upload button and select the app file included in your web part package;
- Once the upload is complete, go to the site collection where you want to add the web part;
- Open Site Contents;
- Type BTTiles Add-in in the search bar and select the app. Click on the Trust it button. Now you must wait for the app to finish installing on the page.
- Once the installation is done, click on the app;
- Now select Install Add-In;
The page will begin deploying the web part into your site. Once it’s finished you will have it available in you site collection.
Web Part installed! ✅
ADD THE APP ON OTHER SITE COLLECTIONS
To add the app to other site collections, simply repeat steps 9 through 14.
In SharePoint 2013 on premises, you may need to configure the **SharePoint app store** before you can install apps. If you need any guidance, check out this article: https://blogs.technet.microsoft.com/mspfe/2013/01/31/how-to-configure-sharepoint-2013-on- premises-deployments-for-apps/.
Installation done! To complete the set up process the only thing left to do now is to configure the web part.
Next - Configuration