The NSIS Portable download doesn't seem to download correctly in the app software center, it's suggesting an incomplete download or other network issue. I doubt it's my network as trying to download directly from the site it's fine and other apps in the software center seems to install correctly, at least that I can see. Suggests the location programmed into the app center might be incorrect or ending the download.
I forgot to update the version number so it was downloading 3.11 and expecting the SHA256 for 3.12. Thanks for the heads up.
Sometimes, the impossible can become possible, if you're awesome!
No problems! Glad to be of help
your friendly neighbourhood ex-Moderator and developer Zach Thibeau