Hi,

After library(lme4)

the message was that I needed to install Matrix pakage

I tried it

The message was Matrix p is not available for R431

How could I make lme4 package work without Matrix package?

The easiest solution to your problem is to upgrade your R to the latest version. Can you do that?

Since Matrix has a very restrictive R >= 4.4.0 condition i would suggest

```
install.packages('Matrix', repos = "https://packagemanager.posit.co/cran/2024-01-12")
```

This will give you the 1.6-5 version of the Matrix package where they had only the restriction R>=3.5.0 so you should be safe.

You can't it is a dependency of lme4 and it won't work without the Matrix package being installed.

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