TMS320F28035: v6.3

Part Number: TMS320F28035

I have an old board with a TMS320F28035 processor.  The application code was developed in CCSv6.3.  I am having considerable issues trying to get my code imported and running in V20.5.0.28__1.11.0.  There used to be a page to download and install older CCS versions.  I can't find it now.  Can anyone provide a link?  Thx!