bananasmarties

You most certainly can and they have to provide you the data. GDPR is about you as an individual and the login itself is irrelevant. Chances are you'd most likely hit the same wall when talking to the customer support.

Many of those would be broken in various ways if they were not updated. For starters: VLC due to missing codecs, firefox not supporting newer standards. All the software you mentioned was most likely heavily updated since your teens.