ITR F.Y. 2018-2019 offline mode

Refer Rule 12 of the Income-tax Rules, 1962....it will give you guidance...

Last date is extended to July 31, 2020

Paper mode of furnishing return is permissible only in case of super senior citizens (i.e. an individual of the age of 80 years or more at any time during the previous year)
And for above mentioned super senior citizens, only ITR 1 and ITR 4 is allowed to file in paper form.
You can file above form at the designated offices of Income-tax Department, along with duly signed Form ITR 1/4.
In case of paper returns the information in certain columns which is being auto- populated in online return, has to be computed and furnished by the taxpayer manually.
Last date for F.Y 2018-19 is 31st July,2020
Ann For F.Y 2019-20 it's 30th November, 2020