Uninstall went wrong

Hi there,
I had the same error as mentioned in kubik-rubik.de/forum/sige-simple-image-g...ved-please-try-again and wanted to apply your solution. 

I'm running Joomla 5.0.1. As far as I remember (...) I removed all none-joomla plugins before upgrading from J4 except SIGE since v4.4 was compatible with J5 and forgot to remove the Button and its v4.1.1

When I now went into the plugin folder I saw I had:

• Button - SIGE Editor Pro, v4.1.1.0-PRO dated 23-07-07
• Content - Simple Gallery Extended Pro - SIGE, v4.4.0.0-PRO dated 23-10-18
• Simple Image Gallery Extended Pro - SIGE, v4.4.0.0-PRO dated 23-10-18

That was odd, why not the v5?! I assumed I should have done a manual install of the latest v5?! Nevertheless, I marked all three and hit Uninstall. All plugins except "Simple Image Gallery Extended Pro - SIGE" got uninstalled and that with the following messages:

Danger
- Simple Image Gallery Extended Pro - Installation failed!
- Requirements are not met for the execution! The installation process was stopped to avoid errors.
- The Joomla! version is not supported. The version must be lower than Joomla! version 5.0.0! Please use a compatible Joomla! version to be able to use this extension.
Warning
- Extension Uninstall: Custom install routine failure.
Info
- Error uninstalling component.

Unfortunately I forgot to make a backup before doing the failed uninstall so I installed the new version on top of this. Seems to work but I'm not sure I'm happy with this "dirty" installation. Can I in some way uninstall v5 and ensure that all traces of SIGE are completely gone and then do a new, not dirty, install?

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