@Ana Girl1918 I would love to see pictures and your review. I have read a few reviews from people who had a hard time getting the planks to click together.

Yikes, we just had a local Flooring Contractor begin our flooring project. We're replacing the carpet that was original to the home, and ripping out the tile in several areas to install LVP over slab. The Contractor talked a great game, telling us about his 15 years experience and his "5 Star" reviews. When I asked about getting the old carpet glue up, he assured me he had a "power scraper" that will take the glue right up. Asked about filling nail holes from tack strips, he said he had self leveling stuff to fill those. My wife and I knowing we were getting new flooring began removing old carpet and tack strips where accessible. I filled the little craters left by pulling up the tack strip and scraped up what I could with the glue. Figuring this would save some time for the contractor. Well when it came to do the actual prep, he suddenly changed tune saying he's never fills those hole in the concrete it doesn't affect the floor at all and is a waste of time. I can see that might be true with the small holes, but pulling up the tack strips left from pretty sizable "craters." The next "red flag" was when he changed his tune on scraping the glue, he claimed the underlayment would take up any imperfections and we'd never notice once the floors are in. He said something interesting, when he said that when he's installing he asks himself if the floor will feel good under foot to the customer. Which we took to mean, if the customer never knows he didn't do a proper prep or follow manufacturer installation requirements, it's a win. When it came to following Manufacturers installation procedure, he claimed that's just CYA stuff and he does it his way. Running the underlayment perpendicular to the direction of the LVP, nah, he said you don't really need to do that, besides it takes more time. Then there's the logistic accommodations we went over with him from the get go, due to our pets. He agreed to 3 phases...until he began work then he suddenly claimed he never agreed to 3 phases, just two, then went into how he's never had a client who couldn't just put the pets in carriers and put them all in one room, then he questioned why we would adopt feral cats. That was not his job to judge our choice to rescue some cats. Oh it gets worse, with him not respecting our property. When he was taking up the tile in a bathroom, he put the toilet in our Jacuzzi shower. Did not cover the glass shower doors to protect them from "flying" mastic and tile chips. When we called him on it, the excuse was "I know what that shower is made of, and putting the toilet in there won't hurt it." We said that wasn't the point, the point was you didn't respect our property. Anyway it was excuse after excuse, argument after argument about how we trying to tell him how to do his job. Well in the end he was pretty pissed off that we expected he followed through on things we discussed and do a proper surface prep, so he quit the job. We now have a living room with basically a pallet of LVP, boxes of QuietWalk and bundles of base board. We've got another contractor coming in a few days to give us a quote on completing the project.

....oh....my....."Installer tried to level out the subfloor in those areas with cardboard but it didn’t work." No kidding! Wow! I haven't seen that trick with lvp before. And there's a reason for it. S/He just blew your ENTIRE warranty. Subfloor prep work MUST be done as the installation instructions require. LVP HATES anything 'squishy' underneath it. It MUST BE rigid. Card board is for the boxes you use to cart his tools to the curb! If this guy KNEW your subfloor was SOOOOO bad that he felt cardboard would work, then your subfloor prep should be in the $2-$3/sf range. If you did NOT pay for subfloor prep, you (I'm very sad to say) got what you paid for (I know that sounds mean...but it is a very sad truth...so sorry :"( I pray to all that is holy you did NOT pay him! Please find another person to install this for you. Your installer is poorly trained and is not ready for something like LVP. S/he simply does not know the product and is trying to "figure things out" as long as you let him/her do it. And to be clear, it is entirely possible you will lose 25% of your planks when they are pulled up. The click edges on vinyl are very sensitive. They break just by looking at them. Once they break, the plank (or most of it) is lost. Please ensure the product is still stocked and you can access MORE when the right flooring installer is found and offers to deal with these issues....for the proper price. Free rarely turns out to be in the building industry.

All the grout lines need to be filled and the floor flat to within 1/8" over 10'. Vinyl loves to telegraph every imperfection and those grout joints will do that in short order.