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Hi,
i try install package rvmedia ver 5 or 6.11 but error compile on message

Compile package RVMediaLaz 1.0: Exit code 1, Errors: 3
MRVMessages.pas(51,19) Error: Identifier not found "specialize"
MRVMessages.pas(51,30) Error: class type expected, but got "<erroneous type>"
MRVMessages.pas(51,30) Fatal: Syntax error, ")" expected but "identifier TFPGMAP" found

can help me ?
thank you

If you want to install an old version of RVMedia in Lazarus, you need an old version of Lazarus as well.
But I suggest to upgrade to the new version (RVMedia 8) and new version of Lazarus instead.