Birthday module not working

Hello! I have just downloaded and installed Dolibarr and I thought it would be nice to have a birthday calendar attached. I bought a module called Birthday, installed it but when I run it I get this error:

Warning : require(…/main.inc.php): failed to open stream: No such file or directory in D:\Dolibarr\dolibarr\www\dolibarr\htdocs\custom\birthday\liste.php on line 24

Fatal error : require(): Failed opening required ‘…/main.inc.php’ (include_path=’.;C:\php\pear’) in D:\Dolibarr\dolibarr\www\dolibarr\htdocs\custom\birthday\liste.php on line 24

Am I doing something wrong?

Hello,

There is no support for external module on this forum.

If you are talking about Birthday it seems to be compatible only V7 max.
And, as a very old external module, it should be but directly on/htdocs/not on /htdocs/custom

“There is no support for external module on this forum.”
Understood.
Thank you verry much though