I would imagine you'd have to carefully scrape it off and then sand. Is this on a finished floor?
I doubt there is a solvent that would remove it and not affect the floor finish.
From the PL Premium site: How do I remove LePage® PL® Premium after it has cured? LePage® PL® Premium is very difficult to remove once it is cured. Therefore, it is extremely important to clean up any spills of PL® Premium before it has a chance to cure. A cloth dampened with mineral spirits will help to remove any uncured PL® Premium from surfaces and tools. Once PL® Premium has cured however, it can only be removed by mechanical abrasion (i.e. scraping or sanding). Soaking the area in LePage® Poly® Super Strippa first will help in softening the adhesive however this will cause damage to any finished surfaces. Test area before use for compatibility.