Beginning March 22nd, USCIS will only accept the revised version of Form I-539 Application to Extend/Change Nonimmigrant Status with edition date 02/04/2019. USCIS will reject any Form I-539 with an edition date of 12/23/16, or earlier, that is received by USCIS after March 21st.
USCIS will accept the 12/23/16 version of Form I-539 from now until close of business on March 21st.
The revised version of Form I-539 will be published on the USCIS website today, March 8, 2019. In addition, USCIS will be publishing a new Form I-539A Supplemental Information for Application to Extend/Change Nonimmigrant Status, on the Form I-539 webpage on March 8. Form I-539A replaces the Supplement A provided in previous versions of Form I-539. Form I-539A can only be submitted along with Form I-539.