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failure to fetch ionic packages due to registry isssue help

C:\Users\George Ethical>npm install -g ionic
npm WARN registry Unexpected warning for https://registry.npmjs.org/: Miscellaneous Warning EINTEGRITY: sha512-UFHBtXhMfT5TLemND7ZUGIWoZYSMPzw3AXNznznCPbTd/KVV1diWRDKS8Lawc2bglKVu1dMPrnKMpcW1OrUsWw== integrity checksum failed when using sha512: wanted sha512-UFHBtXhMfT5TLemND7ZUGIWoZYSMPzw3AXNznznCPbTd/KVV1diWRDKS8Lawc2bglKVu1dMPrnKMpcW1OrUsWw== but got sha512-ybiFS8qkfrymOJZCqBVqs6Xh/+pv/ysDR59JAHM5wmTqevWUriOIMcygVasDsCDKt0sWErDBZG60cYORbxyxEg==. (9264 bytes)
npm WARN registry Using stale data from https://registry.npmjs.org/ due to a request error during revalidation.
npm ERR! code EINTEGRITY
npm ERR! errno EINTEGRITY
npm ERR! Invalid response body while trying to fetch https://registry.npmjs.org/tmp: Integrity verification failed for sha512-UFHBtXhMfT5TLemND7ZUGIWoZYSMPzw3AXNznznCPbTd/KVV1diWRDKS8Lawc2bglKVu1dMPrnKMpcW1OrUsWw== (C:\Users\George Ethical\AppData\Roaming\npm-cache_cacache\content-v2\sha512\50\51\c1b5784c7d3e532de98d0fb6541885a865848c3f3c370173739f39c23db4ddfca555d5d896443292f0b6b07366e094a56ed5d30fae728ca5c5b53ab52c5b)


There is a troubleshooting guide here: