[Fix] `install`: fix method=script install condition

Fixes #2665; see 8937917

.github/workflows/windows-npm.yml

@@ -108,7 +108,7 @@ jobs:
           - '10'
         method:
           - ''
-          # - 'script' # TODO: uncomment this.
+          - 'script'
     steps:
       - uses: Vampire/setup-wsl@v1
         with:

install.sh

@@ -373,7 +373,7 @@ nvm_do_install() {
     fi
     install_nvm_from_git
   elif [ "${METHOD}" = 'script' ]; then
-    if ! nvm_has curl || nvm_has wget; then
+    if ! nvm_has curl && ! nvm_has wget; then
       nvm_echo >&2 "You need curl or wget to install nvm"
       exit 1
     fi