It's better with the 8 version number in the middle (thanks shong).

The issue was still here. If I check the .log file, I saw this :

• MESSAGE Connection to https://update.talend.com/Studio/8/base/p2.index failed on PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Retry attempt 0 started javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
• INFO org.talend.studiolite.p2.update.StudioLiteP2Update - Can't find the update properties file at https://update.talend.com/Studio/8/updates/latest
• ERROR org.talend.commons.exception.CommonExceptionHandler - Unable to read repository at https://update.talend.com/Studio/8/base/content.xml

I'll modify my cacerts file ( in zulu11\lib\security on my install ) to add the certificate of our VPN and it woks fine now ! Case closed