I tried to install nightly JBT on clean Eclipse Oxygen.1a (4.7.1a) Eclipse JEE and I got the message (see below). After that I was able to install everything but it would be nice not to have that conflict at all.

Your original request has been modified.
"Mylyn WikiText AsciiDoc UI" is already installed, so an update will be performed instead.
"Mylyn WikiText AsciiDoc" is already installed, so an update will be performed instead.
Cannot complete the install because of a conflicting dependency.
Software being installed: Mylyn WikiText AsciiDoc UI 3.0.18.201708231851 (org.eclipse.mylyn.wikitext.asciidoc.ui 3.0.18.201708231851)
Software currently installed: Mylyn WikiText 3.0.6.201703111926 (org.eclipse.mylyn.wikitext_feature.feature.group 3.0.6.201703111926)
Only one of the following can be installed at once:
Mylyn WikiText AsciiDoc UI 3.0.6.201703111926 (org.eclipse.mylyn.wikitext.asciidoc.ui 3.0.6.201703111926)
Mylyn WikiText AsciiDoc UI 3.0.18.201708231851 (org.eclipse.mylyn.wikitext.asciidoc.ui 3.0.18.201708231851)
Cannot satisfy dependency:
From: Mylyn WikiText Editors 3.0.6.201703111926 (org.eclipse.mylyn.wikitext.editors_feature.feature.group 3.0.6.201703111926)
To: org.eclipse.mylyn.wikitext.asciidoc.ui [3.0.6.201703111926]
Cannot satisfy dependency:
From: Mylyn WikiText 3.0.6.201703111926 (org.eclipse.mylyn.wikitext_feature.feature.group 3.0.6.201703111926)
To: org.eclipse.mylyn.wikitext.editors_feature.feature.group [3.0.6.201703111926]