Created attachment 414788 [details] output of emerge ktorrent net-p2p/ktorrent-4.3.1-r1 cannot be installed with plasma because it depends on kde-apps/kde4-l10n-15.08.0-r1 and this package blocks all plasma packages. the output of emerge and emerge --info is attached I think that it could be solved temporary having an plasma USE flag for this package and disable the dependency with kde4-l10n. thanks in advance :)
Created attachment 414790 [details] output of emerge --info
Did you try with kde4-l10n-15.08.1?
You need to set USE=minimal for kde4-l10n, otherwise it cannot be installed with plasma-5/kde-frameworks.
Actually, ktorrent pulls in kde-apps/kde4-l10n-4.14.3 on your system, hence the block. You need to unmask at least kde4-l10n-15.08.0-r1, as portage is telling you there: [blocks B ] <kde-apps/kde4-l10n-15.08.0-r1