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Installer for v17.5 now that v18 is released

I have a RED 10 that I've been using when with v17.5.  When I first upgraded to v18 it worked until v18-MR2.  I want to go back to using v17.5 but since I've updated from v18 to v18-MR2 I don't have a v17.5 firmware in my history.

I can't find the installer for v17.5 in mySophos portal.  Is there a place where installers for the latest version of an older release are available?