Forum OpenACS Q&A: install-ns.sh script naviserver version change from 11 to 12?

can i change naviserver version from 11 to 10 on line 210 of the:
https://github.com/gustafn/install-ns/blob/master/install-ns.sh#L210
?
210 version_ns=${version_ns}
correction not line 210 but on
line 29 version_ns=4.99.11
change line 29 to version ns=4.99.12