PlugInstall threw "not an editor command" on Windows

I followed the instruction to install vim-plug and created a minimal config file `_vimrc_temp` (only 3 lines)

then started Vim with `vim -u .\_vimrc_temp`.
It prompted "**Press ENTER or type command to continue**" (no other message).
Then I pressed ENTER and executed `:PlugInstall` and it raised `not an editor command`:

------------------------------

The whole config file:

```
call plug#begin()
Plug 'junegunn/vim-easy-align'
call plug#end()
```

I also tried some paths like:
```
call plug#begin(glob('~\vimfiles\plugged'))
call plug#begin(glob('~/vimfiles/plugged'))
```

## environment

```
VIM - Vi IMproved 9.0 (2022 Jun 28, 编译于 Sep 14 2022 22:03:49)
MS-Windows 64 位控制台版本
包含补丁: 1-467
编译者 appveyor@APPVYR-WIN
巨型版本 无图形界面。 可使用(+)与不可使用(-)的功能:
+acl +ex_extra +multi_lang -tag_any_white
+arabic +extra_search +mzscheme/dyn -tcl
+autocmd -farsi -netbeans_intg +termguicolors
+autochdir +file_in_path +num64 +terminal
+autoservername +find_in_path +packages -termresponse
-balloon_eval +float +path_extra +textobjects
+balloon_eval_term +folding +perl/dyn +textprop
-browse -footer +persistent_undo -tgetent
++builtin_terms +gettext/dyn +popupwin +timers
+byte_offset -hangul_input -postscript +title
+channel +iconv/dyn +printer -toolbar
+cindent +insert_expand +profile +user_commands
+clientserver +ipv6 +python/dyn +vartabs
+clipboard +job +python3/dyn +vertsplit
+cmdline_compl +jumplist +quickfix +vim9script
+cmdline_hist +keymap +reltime +viminfo
+cmdline_info +lambda +rightleft +virtualedit
+comments +langmap +ruby/dyn +visual
+conceal +libcall +scrollbind +visualextra
+cryptv +linebreak +signs +vreplace
+cscope +lispindent +smartindent +vtp
+cursorbind +listcmds +sodium/dyn +wildignore
+cursorshape +localmap +sound +wildmenu
+dialog_con +lua/dyn +spell +windows
+diff +menu +startuptime +writebackup
+digraphs +mksession +statusline -xfontset
-dnd +modify_fname -sun_workshop -xim
-ebcdic +mouse +syntax -xpm_w32
+emacs_tags -mouseshape +tag_binary -xterm_save
+eval +multi_byte_ime/dyn -tag_old_static
系统 vimrc 文件: "$VIM\vimrc"
用户 vimrc 文件: "$HOME\_vimrc"
第二用户 vimrc 文件: "$HOME\vimfiles\vimrc"
第三用户 vimrc 文件: "$VIM\_vimrc"
用户 exrc 文件: "$HOME\_exrc"
第二用户 exrc 文件: "$VIM\_exrc"
defaults 文件: "$VIMRUNTIME\defaults.vim"
编译方式: cl -c /W3 /GF /nologo -I. -Iproto -DHAVE_PATHDEF -DWIN32 -DFEAT_CSCOPE -DFEAT_TERMINAL -DFEAT_SOUND -DF
EAT_JOB_CHANNEL -DFEAT_IPV6 -DHAVE_SODIUM -DDYNAMIC_SODIUM -DDYNAMIC_SODIUM_DLL=\"libsodium.dll\" /I "C:\libsodium\include" -DWINVER=0x0501 -D_WIN32_WINNT=0x0501 /source-charset:utf-8 /MP -DHAVE_STDINT_H /Ox /GL -DNDEBUG /Zl /MT /D_CRT_SECURE_NO_DEPRECATE /D_CRT_NONSTDC_NO_DEPRECATE -DFEAT_MBYTE_IME -DDYNAMIC_IME -DDYNAMIC_ICONV -DDYNAMIC_GETTEXT -DFEAT_LUA -DDYNAMIC_LUA -DDYNAMIC_LUA_DLL=\"lua54.dll\" -DFEAT_PYTHON -DDYNAMIC_PYTHON -DDYNAMIC_PYTHON_DLL=\"python27.dll\" -DFEAT_PYTHON3 -DDYNAMIC_PYTHON3 -DDYNAMIC_PYTHON3_DLL=\"python310.dll\" -DFEAT_MZSCHEME -I "C:\racket\include" -DMZ_PRECISE_GC -DDYNAMIC_MZSCHEME -DDYNAMIC_MZSCH_DLL=\"libracket3m_da32rk.dll\" -DDYNAMIC_MZGC_DLL=\"libracket3m_da32rk.dll\" -DFEAT_PERL -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DDYNAMIC_PERL -DDYNAMIC_PERL_DLL=\"perl532.dll\" -DFEAT_RUBY -DDYNAMIC_RUBY -DDYNAMIC_RUBY_DLL=\"x64-msvcrt-ruby300.dll\" -DRUBY_VERSION=30 -DFEAT_HUGE /Fd.\ObjCULYHRZAMD64/ /Zi
链接方式: link /nologo /opt:ref /LTCG oldnames.lib kernel32.lib advapi32.lib shell32.lib gdi32.lib comdlg32.lib ol
e32.lib netapi32.lib uuid.lib user32.lib /machine:AMD64 libcmt.lib /nodefaultlib:lua54.lib /STACK:8388608 /nodefaultlib:python27.lib /nodefaultlib:python310.lib winmm.lib WSock32.lib Ws2_32.lib /PDB:vim.pdb -debug
```

- Type:
- [x] Bug
- [ ] Enhancement
- [ ] Feature Request
- [ ] Question
- OS:
- [ ] All/Other
- [ ] Linux
- [ ] macOS
- [x] Windows
- Vim:
- [x] Terminal Vim
- [ ] GVim
- [ ] Neovim