The CUDNN home page is https://developer.nvidia.com/cudnn/.

To use CUDNN, you’ll use the module tool.

You can see what versions are available by using:

[me@login01 ~]$ module avail cudnn/


------------------------------- /opt/modulefiles -------------------------------
   cudnn/7.6.5    cudnn/8.1.1 (D)

  Where:
   D:  Default Module

Use "module spider" to find all possible modules and extensions.
Use "module keyword key1 key2 ..." to search for all possible modules matching
any of the "keys".

To load a specific version, you would use:

[me@login01 ~]$ module load cudnn/8.1.1

while the “cudnn” wildcard will load the default version, cudnn-8.1.1 in this case.