Registration for IPCC is valid for 4 years.
After that it can be renewed for another 4 years by paying Rs. 400/-
Though registration has been closed under old scheme, but old students will be allowed to revalidate their registration to avail the available attempts.
As per current status, the last exam for old IPCC will be in May-2019, unless extended further. After that students have to shift themselves into the new course.
So, you are still eligible to give the exams. All you have to do is revalidate your registration before applying for May-2019 exams, as your registration has expired in July-2018.
Now, online facility is also available for the same, but don’t know much about it. You can see it from the link mentioned below, otherwise there is also the traditional form and draft method.
https://bit.ly/2SzPnUc
https://resource.cdn.icai.org/48366bos32413.pdf
https://sdb.icai.org/stud/defaul.aspx
All the best!