We don't have a limit on how many CGI scripts you can install. However, there are some scripts that we will not allow. But in general, you are free to install scripts as long as they do not use too many server resources, cause the server to become unstable, create a security breach, harm the server or other users, etc.
Make sure when you upload the CGI file DO NOT upload in binary mode, instead use ASCII mode. Uploading in binary will cause the server not to recognize the scripts as executables. Most FTP clients will upload .pl or .cgi files in binary mode by default so you will need to change this. You will need to upload the scripts into your cgi-bin directory for security reasons, however they will execute from anywhere within your account.
The last step is to set the file permissions. This is otherwise known as chmoding and can be done from most FTP clients. Make sure you CHMOD your scripts to "755" otherwise you will get errors.
If you are unable to change permissions please contact NetCo Support via a Support Service Ticket with your requirements.