Where can I find 1.8 version of egroupware?
Is there any instruction how to install it?
Why do you want to run 8-year-old software???
We don’t really want to support such old versions. We want to invest our precious time in the current version. Sorry.
You can look into the old wiki:
https://community.egroupware.org/index.php?wikipage=releasenotes1.8+
Stefan