I contacted them I got to know that the project is discontinued since 2008 and the resources are no more maintained.
they have provided with an github repo and an archive file link 

This is the exact reply:
Unfortunately, both UW IMAP and Pine/Alpine development was discontinued back in 2008 and removed from University systems in 2018. A community copy still exists at https://github.com/uw-imap/imap but UW provides no support or resources for it anymore.  It looks like some of the information may still be available via the Wayback Machine https://web.archive.org/web/20080323102305/https://www.washington.edu/imap/  

Mark Crispin, the lead developer at UW, started a fork of it called Panda IMAP when he was laid off in 2008, but he has unfortunately passed away and that no longer seems to be maintained.

what would you like me to do next ?