Hey ! Some news.
I couldn’t launch the script for a reason I can’t explain. So I flashed my phone after a save, and reinstall from scratch the last Sailfish OS version.
After the reinstall, I was able to install android apps and to use some of them. BUT, after something like 5-ish minutes, the same behavior occurred again (crash from the Android App Support, then after a manual restart from the settings entry, the same error status). BUT, after a reset of the phone (shutdown, then restart, not a flash), everything reworks. And for now (2 days), it seems to be stable.
Aside everything, before flashing and with all my datas already saved on my SD card (pictures, etc), my system data storage, if it wasn’t full, was far to be not empty. But after the flashing, and the same applications reinstalled, the same datas on the same place (the datas I know I had/use, the datas from the downloads, like pictures/videos/notes/contacts, etc.), the storage is at 5% only. So my question is, does each new update left some files behind that hoards the storage ?