Install click vinyl despite possibly too high residual moisture.

And in this case it is actually about the perhaps too high residual moisture in the screed, which should be able to escape.

That was exactly our concern. This way the possible residual moisture can escape at the sides and is not blocked by the baseboards.
In many posts here in the forum, mold behind the baseboards occurred because the moisture had nowhere to go. We want to avoid that.

And taking 2-3 days off for this in half a year should be doable. Of course, people tend to get lazy once they have moved in, but I can always motivate myself well for something like this. So, no big deal.

The problem is less about motivation and more about the fact that you will have lots of other things to do. Outdoor facilities, for example ;)

It's more about the fact that the screed tends to settle again in the first year.

Are there specific conditions under which this happens?

I haven't figured it out yet. Possibly if the screed dried too quickly beforehand and warped as a result. Then it sinks again later... That happened in my condominium. There I have up to 1 cm below my baseboards. At that time, everything was already finished by the developer of course. Back then, I had at most 3 mm under some spots. Apparently, it also happened in our shower. Or the tiler messed up there. It's hard to say afterward. In any case, I now need a water stop profile there and always have to mop the floor after showering. Very annoying.

That was exactly our point. This way, any possible residual moisture can escape at the sides and is not blocked by the baseboards. In many posts here in the forum, mold developed behind the baseboards because the moisture had nowhere to go. We want to avoid that.

That is why every installation manual for parquet and laminate states that a vapor barrier must be installed on screed floors and extended up the wall area. HARO also includes this in the installation manual for click vinyl.

And taking 2-3 days off for this in half a year should be doable. Of course, once you have moved in, you tend to get lazy, but I am always pretty good at motivating myself for such things. So, it’s not that bad.

Yes... I also thought I knew better before. Every evening 2 or 3 hours after work and then 2x8 hours on weekends, then it’s all done quickly, etc. It’s like with every project... you work like the devil until acceptance (moving in)... and when it comes to the remaining tasks (work after moving in), motivation drops off rapidly.

I haven't figured that out yet. Possibly if the screed dried too quickly beforehand and thus warped. Then it settles down again later... That happened in my condominium. There I have partially 1cm below my baseboards. Back then it was from the property developer, so of course everything was already finished. (...)

It can probably happen if the screed is treated incorrectly, for example in the current weather just leaving all the windows on tilt and then not going there for 3 weeks. But whether the screed warped or not can be easily checked. Take a long spirit level and place it from the wall into the room. If it's level, where is anything supposed to settle? ;)

That’s why every installation instruction for parquet and laminate states that a vapor barrier must be installed on screed floors and extended up the wall area. HARO also includes this in the installation instructions for click vinyl.

I asked Wineo twice and both employees recommended their silentRigid impact sound insulation. As far as I know, that is not a vapor barrier. But it’s not needed either, since the vinyl is also made of plastic on the underside. How does a vapor barrier extended up the wall help against mold behind it? The moisture has to go somewhere and that probably remains the easiest path. Or otherwise everything below will mold because the remaining moisture can’t escape. That would probably make it worse. Or am I mistaken here?