Can I use the trial version of the RemObjects SDK with upgraded Indy Components?
No, the trial version only supports the “official” versions of Indy that ship with the respective versions of Delphi. Since the trials only ship in .DCU format and without source code (obviously), it would be difficult to provide DCUs matching other Indy versions, given that Indy changes quite frequently. However, Indy is just one of many communication options offered by the RemObjects SDK. You can safely ignore the error (and instruct Delphi to no longer try to load the package), and use one of the many other communication options (for example the WinInet HTTP Channel components) that work without Indy. Once you have the full version of RO/DA, you can (if you still want to use Indy, then) rebuild the RemObjects_Indy_Dx package against the specific version of Indy you are using.