With Release 2 you have to use AmigaGuide. Multiview won't work.
Check out XFD Guide though as a more modern alternative:
http://m68k.aminet.net/package/text/hyper/XFDguideI haven't tried this myself yet, but the docs even mention 1.x users, so I'm sure 2.x will be fine.

For lha files I tend to use GuiArc:
http://m68k.aminet.net/package/util/arc/GuiArcBut you can always use FileMaster or DOPUS
Imploader wouldn't be of any use unless you want to compress your executables and have them decompress on the fly (use only if hard drive space is tight). I found Imploader to have the best compression rate, but it crashes on 040/060 systems....but there is a new imploader.library on aminet which fixes this.
PowerPacker is a similar program for that, but was also widely used to compress text files as well for display by PPMore as opposed to More (which doesn't support decompression).