"Dave (from the UK)"
wrote

Some time back I bought some chess software called Pocket Fritz 2
developed a company called Chessbase in Germany.

(snip)

Unfortunately, I bought the software 2 to 3 years ago, but if it had been
purchased recently (how recently?), would this be a good enough reason to
get a refund of the purchase price? Or could the retailer and/or Chessbase
argue that all non-trivial software has bugs, and so refuse to do so?

I sent an email to ChessBase customer service last week about this problem.
This is the response I received:

"Deah Schweinhundt:

Vee haff receift your complainink letter, danke schoen. Yoo are krazy,
verrueckt, to tink dat you miserable Schweinhundt desserf a refunt! Silly
patzer. ChessBase GmbH duss not giff refunts to amerikaner Schweinhundts
such as yourself. Iff you keep complainink about our products vee vill be
forced to deal mit you in a ferry extreme mannah. Remember how vee took back
den Sudetenland vor der greater glory of des Reichs? Vee can deal mit vermin
like yoo too. Iff yoo don't like our Produkt, bitte go buy somevun else's,
like dose Kommunist Convekta peoples'.

Very best wishes,

Dieter Schwacherschwanz,
Vice-Chancellor, Customer Service"

There you haff it. I mean Have IT.