Port forwarding Time Capsule Airport 7.6.3

Question

Network problems.  I want to run a free software called Maptool 1.3b89.  I created some sweet maps in OS version 10.7.5, and assembled players, but I can't connect with other computers.  I have the Time Capsule (router) with Airport version 7.6.3, updated, Cisco cable modem.  I updated Java when I installed Maptool, less than a month ago.
The Maptool Networking FAQ says UPnP is by far the easiest approach, furthermore,"(An alternative is called NAT-PMP, but they are functionally the same so the second won't be mentioned again.)  "This sounds as if one can plow ahead and get the same result.  Believing they were functionally the same, I enabled NAT-PMP, attempted to connect with the UPnP box checked, and Maptool returned: "no internet gateway devices found UPnP port mapping will not be available."
So I asked, "If I get the server enabled, will it work for windows, or just for mac clients?  Is this where it is functionally the same?" 
Here is the response, though I'm not certain it addresses my concern:  "The NFAQ is incorrect if it says that NAT-PMP is the same as UPNP. NAT-PMP is a new protocol from Apple that only applies to the AirPort routers, although a lot of other routers now support it as well.  I'll fix the FAQ.  There will be a b90 build either tonight or tomorrow that will fix the UPNP bug, but it won't help with NAT-PMP since it's a different protocol.  I'll see if I can find a way to support NAT-PMP but it's not likely to be soon."
Does that translate to, give up or get a different computer, Mac user?
I searched these forums.  The suggestions aren't talking about version 7.6.3 of Airport.  They tell you to go to port mapping, which is not an option/selection offered.  The most useful post says my version of Airport is a toy hammer with no functionality, go get old Airport, version 5.6.  Did that using Unpkg.  Did not run both airports at the same time.  Followed another post that referenced Bit Torrent, thus, I enabled Nat-PMP, and mapped all four ports to 51234, the default port for Maptool.  Airport 5.6 returned: The airport utilty was unable to find your Airport wirless device after restarting, the settings for this wirless device have successfully updated, but there was a problem rejoining the wirless network or finding the Airport wireless device.  you may need to select your network from the Wi-fi menu and try again. 
Lost wireless.  Did a backup from Time machine and still couldn't connect wirelessly.  Restarted and the wirless returned.
The NFAQ says UPnP won't work with port forwarding (at the same time) but that is what seems to need to happen on a Mac.  I tried portforward.com.  Does not have my router.  Followed instructions for the only featured Apple/Macintosh product, Airport Extreme.  Not even close. 
I have clicked all the advanced buttons and menu choices through Airport and through (settings)network, and figured out you can click on the + sign.  The outdated portforward.com info says, "enter both the public and private boxes with the same port number," and shows two boxes, but I have four boxes: IPV4 port mapping, public (and private) UDP ports, Public (and private) TCP ports.  Should I fill all four with port 51234 and use the provided IP address?
  I can't make my IP address static.  I followed the portforward guide and lost my internet connection. Portforward Open Port check tool says, "this program cannot be run in dos mode," with a giant code strip following. Excuse my ignorance, but why is a dos program set up to run a test that is embedded in a Macintosh installation guide? Is that an emulator or a different dos?    Shouldn't it be Unix or something?  It says if I have no internet connection (which I don't at this point) to restore my original settings. Futile.  The user guide offered here isn't my software version but it says to enable NAT-PNP and give the ip adress to the host, but Maptool isn't going to use this special IP because it will only see the public one, right?
I was tempted to buy one of their products like PCconfig but here is what they say, "Instead of manually configuring your network router, just pick your app from a list and update your router with a single click." but they don't bother to indicate whether it works for mac, don't feature my router, and it says you must pick an app, but Maptool is not featured in the giant list of users that, "you are forwarding ports for."  I tried to download PF Setup Static IP Address but the download was a Windows app, so I couldn't run it.
I have tried just enabling Nat-PMP by itself, Canyouseeme.org returns "firewall or ISP is blocking certain parts, error, I could not see your service on (my IP address) port 51234."  I have tried port mapping by itself to port 51234, which causes the time capsule to crash, requiring a backup and reboot to restore the wireless network, and both together, which is contrary to the way it is supposedly done with UPnP.
If I installed Windows that wouldn't change how it networks.  What is my next step, buy another router?
Downloaded Hamachi.  The tutorial no longer launches.  The tech data has removed the mac screen shots and not replaced them, but I can see the headings and blank spots where they should be.   I assume they aren't supporting new mac users.  Logmein was just as obscure.  I don't feel very confident about either product.  The freeware Virtual Network Provider gets reviews like, "hard to use," and "complex interface."
Thanks in advance for your consideration.

Answer 1

If you want to use maptool and it is only going to work with UPNP type router. Then simply replace the TC with a standard router.. it is less than $100 for a very reasonable one like Netgear WNDR3800 which has 3rd party firmware like dd-wrt, openwrt and gargoyle as well as netgear which is pretty but lacks features.
Bridge the TC and keep it as backup target for TM which is what it does best.. and wireless AP for apple devices.