Hi coagmano,
Thanks for your test.
Meteor was never running in my test. Now I’ve tried again with a completely fresh app: meteor create testapp, meteor remove jquery, meteor add jquery@1.11.10! and got the same constraint failure.
Then I set env variable METEOR_LOG=debug and discovered that the constraint check was done using packages and versions dependencies info stored in <meteor_dir>/.meteor/package-metadata/v2.0.1/v2.0.1/packages.data.db
where <meteor_dir> is the location of my meteor installation (not my meteor app). The file is a sqlite db with which I know enough about how to alter the content and also tried to play with it a little bit but no luck.
Eventually, following this suggestion JQuery version conflict - How to handle?
I successfully installed jquery@1.11.10 and bootstrap@3.3.6 as local packages into my meteor-1.9 based app.