Redirects with a % not saving

I am trying to save an old link (/resources/compliance-management-blog/12-02-15/Security_Awareness_Series%E2%80%94Compliance_and_Protection_Why_Policies_Matter_Part_2.aspx) to http://www.powerdms.com/accreditation/security-awareness-series-compliance-and-protection-why-policies-matter-part-2/

however, it is not saving. I can save other links, but not links with a %

https://ww.wp.xz.cn/plugins/simple-301-redirects/