Why I try to open Base, it says "JRE required". How can I fix that?

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Hello,

Because LO Base requires Java to operate (under most circumstances). In future please search for answers on a subject before asking. This question comes up multiple times per week.

What you need to install depends upon your OS & the LO you have installed. Please see my answer here for further info - click here.

If this answers your question please tick the ✔ (upper left area of answer). It helps others to know there was an accepted answer.