<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<!--    <application>iui-js</application> -->
    <application>iui-framework</application>
    <version>51</version>
    <precompilation-enabled>true</precompilation-enabled>
    
    <static-files>
        <include path="/**.gif" expiration="1d" />
        <include path="/**.jpg" expiration="1d" />
        <include path="/**.png" expiration="1d" />
        <include path="/**.ico" expiration="1d" />
        <include path="/**.js" />
        <include path="/**.css"/>
        <include path="**.html"/>
        <include path="/**.frag"/>
        <include path="/**.manifest"/>
        <exclude path="/**.gtpl" />
    </static-files>
 
<!--
    <system-properties>
        <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
    </system-properties>
 -->

</appengine-web-app>

<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
    <application>iui-js</application>
<!--        <application>iui-framework</application> -->
    <version>52</version>
    <precompilation-enabled>true</precompilation-enabled>
    
    <static-files>
        <include path="/**.gif" expiration="1d" />
        <include path="/**.jpg" expiration="1d" />
        <include path="/**.png" expiration="1d" />
        <include path="/**.ico" expiration="1d" />
        <include path="/**.js" />
        <include path="/**.css"/>
        <include path="**.html"/>
        <include path="/**.frag"/>
        <include path="/**.manifest"/>
        <exclude path="/**.gtpl" />
    </static-files>
 
<!--
    <system-properties>
        <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
    </system-properties>
 -->

</appengine-web-app>

Update demo.iui-js.org to beta3 version
Update demo.iui-js.org to beta3 version