I have redownloaded the installer. Still can't install vcredist. I already have 14.0.24215 installed and it tries to install 14.0.23918, so i assume that's the cause.
I will try to get you a test account on the public Openfire server (which i also can't connect to). I was first testing with a test server on my PC. I have tried a number of different options. Disabling encryption doesn't help either. But there is an XML output after all, not sure why it didn't show up first. Not sure if it will be helpful though.
<?xml version="1.0"?>
<stream:stream xmlns:stream="
http://etherx.jabber.org/streams" version="1.0" xml:lang="en" xmlns:xml="
http://www.w3.org/XML/1998/namespace" to="wroot" xmlns="jabber:client">
<?xml version='1.0' encoding='UTF-8'?><stream:stream xmlns:stream="
http://etherx.jabber.org/streams" xmlns="jabber:client" from="wroot" id="a76izzmenl" xml:lang="en" version="1.0">
<stream:features>
<mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
<mechanism>PLAIN</mechanism>
<mechanism>ANONYMOUS</mechanism>
<mechanism>SCRAM-SHA-1</mechanism>
<mechanism>CRAM-MD5</mechanism>
<mechanism>DIGEST-MD5</mechanism>
<mechanism>JIVE-SHAREDSECRET</mechanism>
</mechanisms>
<compression xmlns="
http://jabber.org/features/compress">
<method>zlib</method>
</compression>
<register xmlns="
http://jabber.org/features/iq-register"/>
</stream:features>
<auth xmlns="urn:ietf:params:xml:ns:xmpp-sasl" mechanism="SCRAM-SHA-1">biwsbj1taXJhLHI9K01ndkZyT0dyK1hsUThiVElxWHV2V3BHK01ZQTRxbzA2V3lrUVpQRFZmST0=</auth>
<challenge xmlns="urn:ietf:params:xml:ns:xmpp-sasl">cj0rTWd2RnJPR3IrWGxROGJUSXFYdXZXcEcrTVlBNHFvMDZXeWtRWlBEVmZJPTAzNzQ0MzQwLTY0NDItNDBlMy05NTg1LTA5MzIwMDM1ZGVkNyxzPWJCc3hEc0RzeWpiZTkzbWU4SCt1eHdHZCtKVmxzaDQ1LGk9NDA5Ng==</challenge>
<response xmlns="urn:ietf:params:xml:ns:xmpp-sasl">Yz1iaXdzLHI9K01ndkZyT0dyK1hsUThiVElxWHV2V3BHK01ZQTRxbzA2V3lrUVpQRFZmST0wMzc0NDM0MC02NDQyLTQwZTMtOTU4NS0wOTMyMDAzNWRlZDcscD1haTBkVjVMYnpQQmhLYUpkWHBSblNVMTh1RU09</response>
<success xmlns="urn:ietf:params:xml:ns:xmpp-sasl">dj1KLzY1R2hyMUpLNDF4eTFXSGRDZTZpb3VtL1k9</success>
<?xml version="1.0"?>
<stream:stream xmlns:stream="
http://etherx.jabber.org/streams" version="1.0" xml:lang="en" xmlns:xml="
http://www.w3.org/XML/1998/namespace" to="wroot" xmlns="jabber:client">
<?xml version='1.0' encoding='UTF-8'?><stream:stream xmlns:stream="
http://etherx.jabber.org/streams" xmlns="jabber:client" from="wroot" id="a76izzmenl" xml:lang="en" version="1.0">
<stream:features>
<compression xmlns="
http://jabber.org/features/compress">
<method>zlib</method>
</compression>
<bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"/>
<session xmlns="urn:ietf:params:xml:ns:xmpp-session">
<optional/>
</session>
<sm xmlns="urn:xmpp:sm:2"/>
<sm xmlns="urn:xmpp:sm:3"/>
</stream:features>
<iq type="set" id="bind_1">
<bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">
<resource>wroot</resource>
</bind>
</iq>
<iq xmlns="jabber:client" type="result" id="bind_1" to="wroot/a76izzmenl">
<bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">
<jid>mira@wroot/wroot</jid>
</bind>
</iq>
<enable xmlns="urn:xmpp:sm:3" resume="true"/>
<enabled xmlns="urn:xmpp:sm:3"/>