Here we wrote ALL NECESSARY STEPS, to explain how to install SSL & use HTTPS on WampServer  (just change red words to your actual path) :

1. Click in tray WAMP > Apache > Apache Modules and check socache_shmcb_module(wait for restart and do the same for ssl_module).
2. Open CMD and execute these commands one-by-one (if asked, type i.e. abcd for password-phrase).

   cd c:\wamp\bin\apache\apacheX.X.XX\bin

   (echo [ my_req_ext ]&&echo subjectAltName = DNS:localhost, DNS:*.localhost, IP:127.0.0.1) >> ..\conf\openssl.cnf

   openssl genrsa -aes256 -out mypriv.key 2048 && openssl rsa -in mypriv.key -out mypriv.key
   openssl req -new -x509 -nodes -sha1 -key mypriv.key -out mycert.crt -days 44444 -config ..\conf\openssl.cnf -extensions my_req_ext -subj "/C=US/ST=Distributed/L=Cloud/O=Cluster/CN=localhost"
   
   copy mypriv.key ..\conf\mypriv.key /y && copy mycert.crt ..\conf\mycert.crt /y

3. (Don’t close CMD). Now in Windows, go to folder: c:\wamp\bin\apache\apacheX.X.XX\conf, open httpd.conf and :
   A) Below line Define APACHE_DIR  add this:
   Define SRVROOT ${APACHE_DIR}/
   B) find & uncomment this line:
   Include conf/extra/httpd-ssl.conf
4. Open extra\httpd-ssl.conf file and below <VirtualHost _default_:443> line, find & set these lines :

   DocumentRoot "${INSTALL_DIR}/www"
   ServerName localhost:443
   ...
   ...
   SSLCertificateFile "${SRVROOT}/conf/mycert.crt"
   ...
   SSLCertificateFile "${SRVROOT}/conf/mypriv.key"

5. Save file and in cmd type httpd -t to ensure no errors displayed) and then Restart WAMP.
6. Now open https://localhost in browser,  you will see the browser-warning (Proceed unsafe..) we mentioned in the beginning, you should add the certificate file to Trusted Roots. Open certmgr (from Start/Run), then right click on Certificates > Trusted Root...> Certificates and choose Action>All-Tasks>import and import the mycert.crt file.
7. Restart browser and go to https://localhost 

THAT’S ALL !

Let us know if that helped you.   (btw, if someone still gets an error, like:

then you have to click “Proceed” there).