Error when running pik in Powershell より @devert and @chiefy I will recommend you use uru instead: https://bitbucket.org/jonforums/uru While it doesn't install the versions of Ruby, it works much better than Pik. Considering I haven't had time to work on pik over the last year or so, I think will be better option. なんと、 pik はオワコンでしたか...。誰しも暇な時もあれば忙しいときもあり、忙しければOSSのメンテナンスはできなくなるもの。これは仕方がありませんね。 ということ