I feel your pain. I wanted to buy Ratchet and Clank trilogy on Vita. On the Vita the store wasn’t accepting my password. I known issue that sometimes arises, I read online. My only option was to buy it on the PS3. Because physical is too expensive nowadays. It was a real struggle. I had to discover how to click add to cart because the button is now invisible. I had to add funds with my credit card, because adding with PayPal wasn’t working. I had to remove my credit card from the store because PS3 wanted to authenticate it, but couldn’t. Mind you the funds were already topped up at this point.
Then yeah, I had to delete stuff too. My 250GB SSD was almost full. I avoid WiFi if I can on everything (I’m a network engineer, professional habit), so at least I didn’t have to deal with that.
Anyways, I ended up buying the Trilogy for Vita, plus All4one, plus A Crack in Time for less than just the physical copy of the Trilogy. So, in the end it was still worth it.