I have the same problem but I cannot use the official installer
I am using a compiled version for windows because I will have to implement openssl engines.
My server log:
2021-11-02 15:51:30 WARNING: --topology net30 support for server configs with IPv4 pools will be removed in a future release. Please migrate to --topology subnet as soon as possible.
2021-11-02 15:51:30 DEPRECATED OPTION: --cipher set to 'AES-256-CBC' but missing in --data-ciphers (AES-256-GCM:AES-128-GCM). Future OpenVPN version will ignore --cipher for cipher negotiations. Add 'AES-256-CBC' to --data-ciphers or change --cipher 'AES-256-CBC' to --data-ciphers-fallback 'AES-256-CBC' to silence this warning.
2021-11-02 15:51:30 OpenVPN 2.5.3 x86_64-w64-mingw32 [SSL (OpenSSL)] [LZO] [LZ4] [PKCS11] [AEAD] built on Oct 27 2021
2021-11-02 15:51:30 Windows version 10.0 (Windows 10 or greater) 64bit
2021-11-02 15:51:30 library versions: OpenSSL 1.1.1k 25 Mar 2021, LZO 2.10
2021-11-02 15:51:30 NOTE: your local LAN uses the extremely common subnet address 192.168.0.x or 192.168.1.x. Be aware that this might create routing conflicts if you connect to the VPN server from public locations such as internet cafes that use the same subnet.
2021-11-02 15:51:31 Diffie-Hellman initialized with 2048 bit key
2021-11-02 15:51:31 interactive service msg_channel=0
2021-11-02 15:51:31 ROUTE_GATEWAY 192.168.1.1/255.255.255.0 I=16 HWADDR=7c:76:35:bb
5d
2021-11-02 15:51:31 open_tun
2021-11-02 15:51:31 There are no TAP-Windows nor Wintun adapters on this system. You should be able to create an adapter by using tapctl.exe utility.
2021-11-02 15:51:31 Exiting due to fatal error
So if I want to create a tap interface on my own:
tap_create_adapter: DiInstallDevice failed
Error 0xe0000203
Creating TUN/TAP adapter failed (error 0xe0000203).
Any help will be appreciated!