If port 80 is blocked on the machine you want to install and run TroTop, but port 443 is open, read on ...
The most salient parts are in BOLD:
1. Create your protop installation directory (we'll use /usr/protop for this example on Linux).
2. cd /usr/protop
3. download the protop archive and move it to /usr/protop
4. uncompress it; you'll see the pt3inst* file.
5. set these environment variables:
export PORTALPORT=443
export PORTALOPTIONS='-ssl -nohostverify'
6. create and pt3inst.pf and place this line in it:
-certstorepath /usr/protop/certs
7. run the installer: ./pt3inst
8. Follow the rest of the normal installation instructions.