How long will Sencha continue to support ExtJS4?
ExtJS4 End of Life
How long will Sencha continue to support ExtJS4?
Historically the formula was something like one year past the second subsequent major release. Since Ext JS 6 was released in June 2015, that would end support for Ext JS 4 in June 2016. I believe I've heard talk of extending that date given how quickly Ext JS 6 followed Ext JS 5, but I've not heard anything solid. You might try opening a support ticket for more information.
Here's a page with more information.
https://www.sencha.com/support/#support-policy
Looks like end of life for Ext JS 4 is December 31st, 2016 with options for extended support beyond that.
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