I managed to install the client with PDQ deploy (using the /S option, not /s!!!) but had to create manually a nextcloud.cfg file
I used an existing .cfg file, broke it up into three pieces and created a batch file for the user to execute (wih PDQ deploy you can automate this):
if not exist %LOCALAPPDATA%\Nextcloud*.* md %LOCALAPPDATA%\Nextcloud
type “\iag.local\data\software\algemeen software\Nextcloud\nextcloud.1.cfg.txt” > %LOCALAPPDATA%\Nextcloud\nextcloud.cfg
echo C:/users/%USERNAME%/Appdata/Local/Nextcloud >> %LOCALAPPDATA%\Nextcloud\nextcloud.cfg
type “\iag.local\data\software\algemeen software\Nextcloud\nextcloud.2.cfg.txt” >> %LOCALAPPDATA%\Nextcloud\nextcloud.cfg
echo %USERNAME% >> %LOCALAPPDATA%\Nextcloud\nextcloud.cfg
type “\iag.local\data\software\algemeen software\Nextcloud\nextcloud.3.cfg.txt” >> %LOCALAPPDATA%\Nextcloud\nextcloud.cfg
echo %USERNAME% >> %LOCALAPPDATA%\Nextcloud\nextcloud.cfg