Not all add-ons will work all the time. That’s simply not how the system is designed. Add-on’s will occasionally go down for repair or updates and they sometimes can take weeks to come back up. Rarely an add-on might close down for good. But there is nothing to worry about because we install several add-ons that do the same thing and provide you with the same content. If one goes down, there are several to take its Place.
Some Add-ons that need to be configured, require you to have an account or Username and Password. Some you can get for free by going to the website it says to, and others cost money. Over 95% of apps are free.
Due to the nature of this software. Not all Add-ons work and not all Add-ons work all of the time. The makers of these Add-ons do it as a hobby and not their main job. Websites & servers will from time to time change settings and code, or get too many users, or get shutdown. This may result in an add-on being shut down all together, and therefore no guarantees can be made on the availability of any specific add ons.