I found the plugin download links in your first part but they are not working. When I open Construct 2 I get this error:
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HTML5 exporter
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Unable to load plugin in 'D:\Programme\Steam\steamapps\common\Construct2\Construct2-Win64\exporters\html5\plugins\rex_board\': Cannot open file 'D:\Programme\Steam\steamapps\common\Construct2\Construct2-Win64\exporters\html5\plugins\rex_board\common.js'
This plugin will not be available in the editor.
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OK
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And this one:
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HTML5 exporter
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Unable to load plugin in 'D:\Programme\Steam\steamapps\common\Construct2\Construct2-Win64\exporters\html5\plugins\rex_board_squareTx\': Cannot open file 'D:\Programme\Steam\steamapps\common\Construct2\Construct2-Win64\exporters\html5\plugins\rex_board_squareTx\common.js'
This plugin will not be available in the editor.
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OK
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