Revalidation of ca final

Hello, I am student of old course CA final. I forgot to revalidate my registration and now it is lapsed. When I tried on SSP portal, I am not able to see revalidation form. It’s only conversion form that is available. I have already cleared my first group of CA final in old syllabus. I want to write second group also in old syllabus. Questions I have are 1. Can I still write my exams in old syllabus or I have to compulsory shift to new syllabus? 2. My CA final group one which is already cleared in old syllabus, will be considered cleared only . Correct? 3.If I can write in old syllabus, where will I get revalidation form as it is not available in SSP portal now? Thanks Gurjit