Forum OpenACS Q&A: Re: (Error: can't read "address": no such variable) after Install OpenACS with NaviServer from Scratch

you are probably referring to the install-ns.sh file. This install script "knows" the version numbers from the configuration section at the begin of the script [1]. change the version number of naviserver and the modules from 4.99.11 to 4.99.12 in your downloaded version of the script, and the will get that newest version. i am currently at vacation in greece and can't update the installation script.

-gn
PS: don't run scripts on your machine without looking first, what these are doing.
[1] https://github.com/gustafn/install-ns/blob/master/install-ns.sh#L22