That's interesting to know. Versio (a Dutch/Belgian provider) switched almost 2 years ago from Installatron to the softaculous integration inside DirectAdmin, which is the admin panel they use. The reason they gave was that installatron was too behind with updates. 

Both Installatron and Softaculous mention on their site that they have integration with Plesk. But perhaps there are other such scripts for plex that I don't know about. Probably even

The different providers I have worked with recently are using Plesk for their site administration and they have a different platform for installs. They do provide upgrade packages for applications you have installed.

MediaTemple (Plesk)

Ionos (Plesk)

There are many hosting providers, so what hosting are you using and what is your experience running ImpressCMS on that host? Does the hosting option provide easy install options (like Softaculous)? I will update this list with the information that comes in.