I did succeed in restoring Google Play Store. However, I prefer a strictly limited use by Google of my phone. So I downloaded an alternative GPS app (OsmAnd~). But it turnes out that a program like ObsMapp and also Reisplanner (of the Dutch railways) will not run without certain Google apps.
But still, now everything is reinstalled (and both mentioned apps are running again), I still get the notice ‘will be installed later’ (zal binnenkort worden geinstalleerd), when downloading and installing two apps: Th@s Invasive! and also Swiftkey.
Can it be, that Google is blocking both, because I do NOT want a Google account?