The fern you have is Athyrium nipponicum 'Pictum', which is sometimes labeled and sold as 'Metallicum'. They should be fine in a shady or semi-shady location, in moist soil. Yours is probably suffering from transplant shock and will recover. Often, the old fronds will collapse and lay on the ground, but the new foliage will emerge and stand upright. Some of my long established plants that began new growth earlier this year, have collapsed and the foliage is now on the ground, but as the season progresses, they will recover and form a mound of foliage
Athyrium nipponicum is probably the most prolific member of the Genus and I have sporelings all around the garden, with dozens of color variations. I do not purchase any of the named cultivars, as I can probably find identical colors among the hundreds of new plants that have voluntarily propagated. Two silver leaf ones were found this AM in my lawn while checking for obstructions, prior to mowing.
Good luck!
Rb