If you miss some Macroses ("SwiftAssist", "SwiftSetAssist", "SwiftAssistMe"), you should try
to delete all SwiftAssist's macroses in user/Macros.xml and let addon recreate those properly.

You can also create Macroses manually, but make sure there exists only 1 copy of each Macro in user/Macros.xml:
    <Macro id="13" name="SwiftSetAssist" text="/script SwiftAssist.SetAssist()" iconNum="193" />
    <Macro id="14" name="SwiftAssistMe" text="/script SwiftAssist.AssistMe()" iconNum="51" />
    <Macro id="17" name="SwiftAssist" text="/assist" iconNum="190" />
make sure that IDs are unique