Plogue demos expire every three months.
You can avoid problems by buying a license: https://www.plogue.com/store/
Or, there may be a new demo version here: https://www.plogue.com/bidule/latest/ that will get you going again until that one expires (there may be gap between demos). For spec you need the 32 bit standalone version for windows (download and install and run once) then the matching "Standalone discrete processing test version", otherwise know as "P2" version (download, unzip, and copy to C:\Program Files (x86)\Plogue\Bidule, and use that to launch Plogue).
Lastly, you could use SpecWeb, from this site, which doesn't need Plogue at all.
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