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

Almost.

$ grep -n 4.99.11 install-ns.sh
29:version_ns=4.99.11
31:version_modules=4.99.11

Lines 29 and 31 should be changed to same: 4.99.12