As far as I know, there is no specific rule that freelancers cannot opt for presumptive taxation scheme. Any person having business or professional income can choose to go for presumptive income scheme, provided having satisfied the following conditions:
1. In case of business, the gross receipts (sales) for the concerned financial year should not exceed Rs. 2 crores (Sec 44AD).
2. In case of profession, the gross receipts for the concerned financial year should not exceed Rs. 50 lakhs (44ADA).
As freelancers use their skills for providing services to the customers, they usually come under the category "profession". Hence, they can opt for presumptive taxation, if their gross receipts are reported to be below Rs. 50 lakhs. When one choose this presumptive income scheme, they should report their income equal to or above 50% of their gross receipts. If suppose the gross receipts is above Rs. 50 lakhs or the net profit is less than 50% of the gross receipts, they are liable for tax audit.
For taxpayers opting for presumptive taxation scheme, ITR 4 should be filed. You will not be required to provide the list of expenses incurred. The gross receipts and the net profit and other necessary details such as business name, business code should be filled therein. With this, your balance sheet should also be filled. You can consult a chartered accountant or equally qualified people or TRP to file tax returns.