Hi!
Unfortunately I don't know, where this belongs to (Knossos, HLP Mantis, elsewhere), but I think some optional files in mediavp 3.8.1 mod.json are written UPPER CASE, while they're lower case in 7z archive... And so, 7z downloads but fails to unpack:
WARNING:Thread-13:repo.query: Repo.query(): Expected Spec but got Version instead! (Version('3.8.1-20180814', partial=True))
INFO:Thread-4:util.download: Downloading "https://fsnebula.global.ssl.fastly.net/storage/ec/cc/0bf23e028c26d5175ff52d003bff85b0a17b0ddfc1130d65bdf6d36f6324.png"...
INFO:Thread-3:util.download: Downloading "https://fsnebula.global.ssl.fastly.net/storage/72/a5/316d08a743a35dc144284b9fb9a466ee259e0b22756cd2a032986951527e.png"...
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
INFO:Thread-4:util.download: Downloading "https://fsnebula.org/storage/0d/e7/bf64bcdea9a9c115969cfb784e1ca457d24a7c2da4fc6f213521c3bb6abb.png"...
INFO:Thread-3:util.download: Downloading "https://fsnebula.global.ssl.fastly.net/storage/20/cf/205ecefff5f8b9da7420d795b208d679207ee75917ebbfd74182eec0137e.png"...
INFO:Thread-3:util.download: Downloading "https://fsnebula.org/storage/78/dd/a5d1ae22742614e88cee2599f3684c0888e726d689c60748a534723144bd"...
INFO:Thread-7:util.download: Downloading "https://cf.fsnebula.org/storage/b4/02/12622e5cd8f061f5365cd0078c17c12a350a3a1b00280f4ba7321728fa87"...
INFO:Thread-9:util.download: Downloading "https://cf.fsnebula.org/storage/b8/da/e9e90a83825ab4108f991ff4db324a31ae235e071aa93d73964cec3a5ea7"...
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
INFO:Thread-1:util.download: Downloading "https://fsnebula.org/storage/be/56/2663c3b5a709104404a30ce7268c72332e564526708865123c7b63104357"...
WARNING:Thread-7:tasks.work2: Missing file "MV_Compatibility.vp" from archive "MV_Compatibility.7z" for package "MV_Compatibility" (MediaVPs)!
ERROR:Thread-7:tasks.work2: Failed to unpack archive "MV_Compatibility.7z" for package "MV_Compatibility" (MediaVPs)!
INFO:Thread-4:util.download: Downloading "https://fsnebula.org/storage/22/bc/7d8aae0b2ac245ae23722e4db39ba8e8444005a953b2ecfe78f372b59aaf"...
INFO:Thread-5:util.download: Downloading "https://cf.fsnebula.org/storage/48/44/5a4fd4ccbe90307c4fa8dcd5fee49a396965fddbf3dc1a129531e1843fa4"...
INFO:Thread-6:util.download: Downloading "https://porphyrion.feralhosting.com/datacorder/nebula/d1/ad/d1f801000b14927aee31fa3cdf444b8f2c9610fc36be158cc77efe086ad4"...
INFO:Thread-10:util.download: Downloading "https://porphyrion.feralhosting.com/datacorder/nebula/4f/a1/a715801439cbc66cb627b90adf169c07e412311c389e538e79ee5d05ecf4"...
WARNING:Thread-9:tasks.work2: Missing file "MV_Advanced.vp" from archive "MV_Advanced.7z" for package "MV_Advanced" (MediaVPs)!
ERROR:Thread-9:tasks.work2: Failed to unpack archive "MV_Advanced.7z" for package "MV_Advanced" (MediaVPs)!
INFO:Thread-8:util.download: Downloading "https://porphyrion.feralhosting.com/datacorder/nebula/e6/65/35092355da5b2e67ff7977633f2c743e6c809993f29c48916c77388056ec"...
INFO:Thread-2:util.download: Downloading "https://cf.fsnebula.org/storage/da/10/d33322f3dd57710383fe8684ed803d4ea16a5e54bfd0df1aa415dad37536"...
INFO:Thread-7:util.download: Downloading "https://porphyrion.feralhosting.com/datacorder/nebula/f0/d6/189e936752e4afffe910f4ff8aa90022fe5ff7b6309f4eb76834a7150c11"...
INFO:Thread-5:util.download: Downloading "https://cf.fsnebula.org/storage/c7/97/47a2d793044fe811e13b8cc243b426b64967d335f39f6e4a3ef21411e31e"...
WARNING:Thread-1:tasks.work2: Missing file "MV_CB_ANI_2.vp" from archive "MV_CB_ANI_2.7z" for package "MV_CB_ANI_2" (MediaVPs)!
ERROR:Thread-1:tasks.work2: Failed to unpack archive "MV_CB_ANI_2.7z" for package "MV_CB_ANI_2" (MediaVPs)!
INFO:Thread-4:util.download: Downloading "https://porphyrion.feralhosting.com/datacorder/nebula/da/c2/6b9ebd9f82334c523ef32dcb5aed7780d70374dd3df3d8739c17bccdc326"...
WARNING:Thread-5:tasks.work2: Missing file "MV_Assets.vp" from archive "MV_Assets.7z" for package "MV_Assets" (MediaVPs)!
ERROR:Thread-5:tasks.work2: Failed to unpack archive "MV_Assets.7z" for package "MV_Assets" (MediaVPs)!
INFO:Thread-3:util.download: Downloading "https://porphyrion.feralhosting.com/datacorder/nebula/93/04/c6c9f16680fc2d14a8e330bb907d9488d78bbf4640f7fbc4629248de6c39"...
INFO:Thread-9:util.download: Downloading "http://swc.fs2downloads.com/builds/nightly/20180814_1307636/nightly_20180814_1307636-builds-Linux.tar.gz"...
WARNING:Thread-7:tasks.work2: Missing file "MV_CB_ANI_1.vp" from archive "MV_CB_ANI_1.7z" for package "MV_CB_ANI_1" (MediaVPs)!
ERROR:Thread-7:tasks.work2: Failed to unpack archive "MV_CB_ANI_1.7z" for package "MV_CB_ANI_1" (MediaVPs)!
WARNING:Thread-2:tasks.work2: Missing file "MV_CB_ANI_3.vp" from archive "MV_CB_ANI_3.7z" for package "MV_CB_ANI_3" (MediaVPs)!
ERROR:Thread-2:tasks.work2: Failed to unpack archive "MV_CB_ANI_3.7z" for package "MV_CB_ANI_3" (MediaVPs)!
Oh, and where can I get help in bringing my "MOD" to work in Knossos (just a bunch of tables I want to load when selecting mod)? The mod shows up but it doesn't load anything...