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I tried to install the dictionary again. This time I did not get an error message, so I clicked on 'install'. However, the language option does not show up in the email. Can you please tell me what is wrong?

Táto recenzia je pre predchádzajúcu verziu doplnku (3.1.3).  Tento používateľ má predchádzajúcu recenziu tohto doplnku.

Sorry to hear that. On my end it seems to properly install in 60.4.0 and 65 beta.
Are you sure you have spellcheck enabled in Options > Compose > Spellcheck?
You also might try to uninstall the add-on properly, restart Thunderbird, go to Hamburger menu > Add-ons > Dictionairies > top-right search on addons,thunderbird.net and type "woordenboek" and install again.