For some time we'll keep 1.7 as the "Previous" branch in the designer UI. The 2.1.x designer UI has been fully tested against 1.7 libraries and plugins.
This means that you can take your time upgrading to 2.1 when you are ready.
To keep using 1.7:
1. From the menu select Edit -> General Settings
2. Go to the library versions tab.
3. Change the stream to "Previous".
4. In Arduino IDE, make sure you do not upgrade beyond the versions recommended in the designer.
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