dunno if the below is your problem, but it seems like it MIGHT be, if predictive text really isnt in your store:

you need to buy 1 license per device. if you use it on one device, and lose it and replace with a new device with a new IMEI, you need to contact jolla and ask them to clear the old IMEI from you license key.

both predictive text and aliendalvik will be missing from the store UNLESS you are logged in on a jolla account that has a license key that matches your current IMEI.

you can also just find+install the rpm without purchasing a license, if you enjoy stealing from the best android competitor that currently exists. (i did this, when i switched from X to Xcompact, so that i didnt have to bother asking them to remove my IMEI. i downloaded it on the old phone, copied it to the new, then reflashed android and sold the old phone)