Drupal 10, how to install it?

You can not install using composer require 'drupal/sqlsrv:^4.3'
You must in your composer file, set to download to folder
WEBROOT/modules/contrib/sqlsrv
Then it might work

In composer.json add the following if install should be on mssql with D10

"scripts": {
"post-autoload-dump": [
"echo '***************** download sqlsrv 4.3.1 ***************'",
"wget https://ftp.drupal.org/files/projects/sqlsrv-4.3.1.tar.gz; tar -zxvf sqlsrv-4.3.1.tar.gz; mv sqlsrv web/modules/contrib/"
]
}

I've started a new issue for tracking work that needs doing on this project to get a Drupal 10 compatible release.

it turned out that
1. i had to remove composer.lock
2. run composer self-update
3. run composer update
4. set settings.php as you said with
trust_server_certificate=1
5. then do a db install with drush
6. then go to site and wait forever

Marking as fixed, since you resolved your issue.

Automatically closed - issue fixed for 2 weeks with no activity.