But the 7.2+ version is not compatible with vaadin 7.1+. We checked the source code and made a version for 7.1.
If you need a 7.1 compatible switch AddOn, simply use this archive. It's a zip archive which contains the pre-compiled class files and changed source files. Simply use the zip (or rename it to jar) to rebuild your widgetset.
Don't use the 7.1 version for 7.2 because the API is different and it won't work. Simply use the original version for 7.2 and newer.