public override async Task Install(IInstallerSession installerSession, CancellationToken cancelToken,
string constraint = null) {
await base.Install(installerSession, cancelToken, constraint).ConfigureAwait(false);
//foreach (var c in GetCollections(constraint))
//await c.Content.PostInstall(installerSession, cancelToken, true).ConfigureAwait(false);
Installed(constraint ?? Version, true);
}