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If you are interested in resolving the same issue in Opera 30.0.1835.125 (or later), please proceed here.
There is a plenty of stone age machines, where the modern versions of Adobe Flash are just unusable, whereas the old ones work acceptable. But by default Opera blocks usage of outdated plugins and forces to update them.
Is there a way to resolve that and continue to use old version of the plugin?
You may want to note that this opens you up to getting infected by drive by downloads that exploit weaknesses in earlier versions of Flash Player. – ssnobody – 2015-07-21T22:25:01.013