So Lenovo doesn’t release new drivers for my 81C3, so I tried (and failed) to install something directly from Intel. After some adventures with two others, I reverted back to the 2018 driver (OpenCL apps crashed, like the ones from Affinity).
Now I’ve found something newer that runs. You need to download the driver for a ThinkPad, like that one: https://support.lenovo.com/de/en/downloads/ds502320/
It’s not supported to install, but you can extract it. Use the Device Manager to update. Works fine and you can use the Intel Control Center and the new one from the store.