We need preciser terminology to solve this
Inside QTIrreco, you can either download a QTIrreco-Remote (an immediately usable Remote control, with buttons placed and actions assigned, but only working with QTIrreco) or a LIRC-remote config file (which describes the possible actions and IR codes emitted by an IR control device and is the building block to build a QTIrreco-Remote)).
From the former, only very few are yet available. It up to us as users to create such Remotes and upload them to the QTIrreco-Server.
Of the latter, there is a large database available, built over the years by the linux LIRC community. It is also available through the QTIrreco app when you want to prepare a new QTIrreco-Remote (the base config you need). If your remote control is not in there, you need to have LIRC or WinLIRC installed on your PC with a IR receiver, then train/learn the codes, safe them in a config, and upload them to that database.

(BTW: Did someone ever find a way to convert the available Philips Pronto database to the lirc format?)