AGet requires "amisslmaster.library" in SYS:libs, once executed it generates a Guru, see screenshot
Are you sure AGet requires that? It would break how AmiSSL is supposed to be installed and updated. If AGet really requires that, it should be bug reported to AGet's author.
Or maybe you just don't have correct assigns for AmiSSL?
AmiSSL should have these kinds of assigns in user-startup:
;BEGIN AmiSSL
Assign AmiSSL: "Your:OwnPath/AmiSSL"
If Exists AmiSSL:Libs
Assign LIBS: AmiSSL:Libs ADD
EndIf
Path AmiSSL: ADD
;END AmiSSL