Install Quick-Step laminate on an existing floor?

Yes, this is possible. The exact installation method depends on which floor you want to install your laminate

ON A DAMP-POROUS FLOOR COVERING

First remove any damp-porous floor covering (i.e. carpet, needle felt, etc.) before installing the Quick-Step Laminate.

ON A DAMP-SEALER FLOOR COVERING

Damp-sealed floor covering (PV, linoleum, VCT, etc.) doesn't have to be removed but a Quick-Step levelling underlay should be installed.

ON A WOODEN SUBFLOOR

When you have a wooden subfloor, you have to remove every existing floor covering first.

Important:

No signs of mould and/or insect infestations should be present.
Make sure the subfloor is level.
Nail down any loose parts.

When you have an uneven timber floor, you must install the Quick-Step underlay Thermolevel. Also, there must be sufficient ventilation in the crawl space underneath the timber floor. The moisture content of the wood must not exceed 10%. Install the new floor at ninety degrees to the existing subfloor.

Learn more:

How to install a laminate floor?