Recently Nexus changed their services to be compliant to the new EU rules. These changes required programs making use of them (such as MO1, NMM and MO2) to be updated to be able to still use Nexus integrations.
Even though MO1 is End of Life and will not get any future updates, enpinion managed to get the Mo1 code to build and has been able to fix this issue. We discussed with Tannin (original creator of MO1 and Mo2) and decided to host here the fixed Legacy version. This does not mean that Mo1 will receive any further updates, or that it is supported in any way. The Mo2 team will continue to work on Mo2 and strive to make it the better program.
Link to the Mo1 source code:
http://git.soundcontact.studio/MO1/ModOrganizer
Mod Organizer 1 original page:
https://www.nexusmods.com/skyrim/mods/1334*Mo1.3.15 changelog*:
Mod Organizer 1.3.12
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* Updated to Nexus' download URI
* Updated to Qt 5.4.2
Mod Organizer 1.3.13
* SSL/TLS function is implemented (to support https).
Mod Organizer 1.3.14
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* Download over CDN and an alternative method to get query metadata is added
* Error #299 caused by Nexus incorrect file content header is now patched. Thanks to the Mod Organizer 2 team for diagnosing the problem.
Mod Organizer 1.3.15
* EU#1 Download server workaround applied.
* Default tab is restored.
Known Issues:
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* All MO1.3.11 known issues.
* Download from Nexus can still give errors due to Nexus Server problems (they have been informed and are investigating), specifically the #EU1 server seems to not return the correct download urls. A workaround is selecting the CDN server (which now is able to provide Premium services) as the favourite server in the MO settings. If this still doesn't work you should try setting another server (different from EU1) instead.
* UI is not DPIAware. It's well known bug for old Qt-based application.
Library Details:
OpenSSL-1.0.2o
Sip: 4.16.9
zlib: 1.2. 11
icu: 53
Credits go to enpinion for the fixes and Tannin for the program.