I am not aware of any old portal. I used this link to apply
https://portal-portail.apps.cic.gc.ca/signin?lang=en
I used the reason 'Reunite with family member - non-dependent child'
I provided all possible documentation to prove that they will not stay back forever in Canada like their property papers back in India, bank account details, my sister's detail(she lives in the states). My parents are retired so could not provide job info so instead I provided the property papers showing that they own property back in India.
I also provided my birth certificate for no reason - just in case they need the proof that they are actually my parents lol.