Users within the company do not have the right to install software on their own so you wish to distribute client-side add-ins via a central place.
SAP Cloud for Customer
Please refer to the documentation at https://documents.support.sap.com/customerincident/u0rsSfIWt-GqW-qsGHjCzBT7eRci9eM6Kdv3XEN9ylg for remote installation of the add-in.
Section 18.104.22.168 talks about the automatic installation.
Please note, the blog post refers to IBM Notes, however, the automatic installation process is the same for all add-ins.
Automatic installation, add-in, central download, client side
KBA , LOD-CRM-GW-LN , Lotus Notes , How To