B4J Question [ABMaterial] how to change core.4.25 to 4.30 in B4JSDemo ?

I'm sorry, I do not understand your question . Are you using ABM 4.30 or 4.25? If you use 4.25, then you need to use the www folder (found in the library folder in the zip), if you use 4.30, then your need that corresponding www folder.

So to recap: Each version of the ABM library NEEDS its own www (js/css/font) files. e.g. You cannot use ABM 4.30 with the ww (js/css/font) folders of ABM 4.25.

i use ABM 4.30 an started B4JS (original files - no copy)
Ii get folowing log

....
2018-06-14 10:09:13.258:INFOejs.AbstractConnector:main: Started ServerConnector@beeaeb{HTTP/1.1,[http/1.1]}{0.0.0.0:51042}
2018-06-14 10:09:13.259:INFOejs.Server:main: Started @3165ms
2018-06-14 10:09:13.259:INFOejs.session:main: Scavenging every 900000ms
/js/core.4.25.min.js
Not Found
/css/materialize.3.75.min.css
Not Found
/favicon.ico
Not Found
...

I cannot reproduce this (but it looks like there is no www folder with js/css/fonts in your app).

I just unzipped everything, went to B4JSDemo, opened it in B4J and ran it. Everything worked.

after NEW download 4.30 -
I just unzipped everything, went to B4JSDemo, opened it in B4J and ran it. Everything worked.

THANKS - seems a problem with files.