I vaguely remember an issue with registering a component which was introduced and fixed somewhere about this time.
Try the following:
1) In Lazarus Menu - Packages -> Open Recent Packages -> richmemopackage.lpk
2) In the opened dialog find "richmemoregister.pas" file and double-click on it
3) In the opened file,
3.1) add Dialogs to the list of used units:
uses
Classes, SysUtils, RichMemo, LResources, PropEdits
, RtfEditPropDialog, Forms, Controls, Dialogs;
3.2) find body of "Register" procedure and replace it with the following:
procedure Register;
begin
ShowMessage('registering richmemo');
RegisterComponents('Common Controls', [TRichMemo]);
RegisterPropertyEditor(TypeInfo(AnsiString),(TRichMemo), 'Rtf', TRichEditProperty);
end;
4) then return to the richmemo package dialog and select "Install". (it will require to rebuild Lazarus and run).
5) Once Lazarus is rebuilt you should see a dialog poping up with verbiage "registering richmemo".
If it's not happening, then I'd think you're having issues getting the new lazarus executable to run.
You might want to see what's located in Lazarus folder. You might find "lazarus.new.exe" file there.