The vast majority of search results for "SecureCRT license free" lead to unofficial, and often dangerous, methods: cracked executable files, key generators (keygens), patches, and "free versions" or "portable editions" posted on various download sites. These are not official releases and represent clear violations of VanDyke's copyright.
Regardless of which tool you choose, these practices will keep you and your infrastructure safe: Securecrt License Free
If you are looking for a completely free (and legal) tool that offers similar functionality, these are the top-rated options: The vast majority of search results for "SecureCRT