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All new stacks released after 26 August 2015 require stacks 3 and are not compatible with stacks 2

Stacks that have new versions for stacks 3 will have the following under their name:

Requires Stacks 3

Deprecated Stacks 2 Version*

In this case you will get a new stacks 3 only version of the stack and in addition a "Legacy' version. Any previously used instances will appear with (Legacy) in there name and are still editable in every way. They are intact the same stacks you had before.

Any new stacks that use use with be the new Stacks 3 version with all the great new features.

You DO NO NEED to replace Legacy (deprecated) stacks that are on your page - they continue to work and be editable.