We need more specific information about which decoders appear to be missing.
There could also be a problem if your friend has been adding custom or prerelease definitions. In this case an Actions->Rebuild Decoder Index may help.
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Dave in Australia
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On 9 Aug 2017, at 9:42 AM, pj_mattson_rvr@... [jmriusers] <jmriusers@...> wrote:
His next problem is the newest JMRI doesn't have some of the decoders he has. He says they are older decoders. Thanks for your help. P. J. Mattson