Is there a simple way to install a new version of GNU make on centos 7? similar to the devtoolset-8.
Or is there only the manual way (download the tar)
CentOS 7 has since since 2020-08-06 passed from "Full updates" to "Maintenance updates".
This is defined as:
Maintenance Updates
Following the “Full Updates” phase, the “Maintenance Updates” phase provided only security errata critical bug fixes for the version. This phase would last for around 4 years, after which the version would enter end of life.
As the update to the latest GNU make is not counted as a "critical bug fix", you won't find the latest version in the repository.
You won't find official releases, but you might be able to find privately compiled versions on the internet.