Thread:Project:Support desk/PCRE UTF8 problem when upgrading from 1.15.4 to 1.17.0/reply (2)

As well as the Fatal message (above) it also gives a Warning message which states: "Warning: The intl PECL extension is not available to handle Unicode normalization, falling back to slow pure-PHP implementation."

So how can it be fatal and at the same time just a warning?

The web installer won't let you proceed even though it is possible to use the falling back position. How can we make it use this fall back position?