Failed to install Synology Application Service

I've got a DS214se. Just had some dramas with a storage pool crashing, deleted the storage pool no problem, I have backups.

But now I cannot install Synology Drive, because it needs Synology Application Service, and every time I try to install that I get 'failed to install the package'.

I've gone as far as a full reset and DSM reinstall, and still get the same thing. Anyone know what the issue might be?

I did actually upgrade from the old sync app to Synology Drive just before the volume crash. Is it possible the DS214 is just too old to work with this? It did work for a couple of days.

I'd have thought the full reset should fix it.