The WU's downloaded here, are not running. 47 aborts so far.

<core_client_version>8.2.11</core_client_version>
<![CDATA[
<message>
app_version download error: couldn't get input files:
<file_xfer_error>
<file_name>bw_runner_228.exe</file_name>
<error_code>-108 (fopen() failed)</error_code>
</file_xfer_error>
</message>
]]>

Thanks for reporting this, and sorry about the wasted downloads. I checked on our side: the file bw_runner_228.exe is served correctly and other Windows machines are receiving it fine. Your machine is the only one hitting this error at this scale. The error (-108, "fopen() failed") means BOINC couldn't save the file on your disk after downloading it. The most common cause is antivirus software blocking or quarantining a new .exe.

Could you try this?

Check your antivirus quarantine/history for bw_runner_228.exe and restore or allow it.
Add the BOINC data folder (usually C:\ProgramData\BOINC) to your antivirus exclusions.
In BOINC Manager, select Eternity@Home and click Reset project so it downloads the files again.
If it still fails after that, let me know which antivirus you use and I'll dig further.

thanks benjamin

here are the messages from the Boinc
30.09.2026 15:47:38 | Eternity II | Requesting new tasks for CPU
30.09.2026 15:47:40 | Eternity II | Scheduler request completed: got 1 new tasks
30.09.2026 15:47:40 | Eternity II | Project requested delay of 7 seconds
30.09.2026 15:47:42 | Eternity II | Started download of bw_runner_228.exe
30.09.2026 15:47:42 | Eternity II | Started download of job_eternity_cf_xp_explore-f1-r0_s262_r2004802114_2004802627.xml
30.09.2026 15:47:42 | Eternity II | Started download of allow_eternity_cf_xp_explore-f1-r0_s262_r2004802114_2004802627.txt
30.09.2026 15:47:42 | Eternity II | Started download of hints_eternity_cf_xp_explore-f1-r0_s262_r2004802114_2004802627.txt
30.09.2026 15:47:42 | Eternity II | Started download of catalog_eternity_cf_xp_explore-f1-r0_s262_r2004802114_2004802627.txt
30.09.2026 15:47:43 | Eternity II | Finished download of bw_runner_228.exe (335872 bytes)
30.09.2026 15:47:43 | Eternity II | Finished download of job_eternity_cf_xp_explore-f1-r0_s262_r2004802114_2004802627.xml (748 bytes)
30.09.2026 15:47:43 | Eternity II | Finished download of allow_eternity_cf_xp_explore-f1-r0_s262_r2004802114_2004802627.txt (707 bytes)
30.09.2026 15:47:43 | Eternity II | Finished download of hints_eternity_cf_xp_explore-f1-r0_s262_r2004802114_2004802627.txt (215 bytes)
30.09.2026 15:47:43 | Eternity II | Finished download of catalog_eternity_cf_xp_explore-f1-r0_s262_r2004802114_2004802627.txt (178420 bytes)
30.09.2026 15:47:44 | Eternity II | md5_file failed for projects/boinc.eternityathome.org_eternity/bw_runner_228.exe: fopen() failed
30.09.2026 15:47:44 | Eternity II | [error] Checksum or signature error for bw_runner_228.exe

This is the contents of the Project Folder
"D:\Boinc\Data\projects\boinc.eternityathome.org_eternity\solver_windows_x64.exe"
"D:\Boinc\Data\projects\boinc.eternityathome.org_eternity\wrapper_26019_windows_x86_x64.exe"
"D:\Boinc\Data\projects\boinc.eternityathome.org_eternity\wrapper_windows_live_227.exe"
"D:\Boinc\Data\projects\boinc.eternityathome.org_eternity\256pieces.txt"
"D:\Boinc\Data\projects\boinc.eternityathome.org_eternity\bw_runner_229.exe"
"D:\Boinc\Data\projects\boinc.eternityathome.org_eternity\campaign_frame2_r65.json"
"D:\Boinc\Data\projects\boinc.eternityathome.org_eternity\catalog_frame2_ce0f69.txt"
"D:\Boinc\Data\projects\boinc.eternityathome.org_eternity\hints_frame2_86d988.txt"
"D:\Boinc\Data\projects\boinc.eternityathome.org_eternity\root_allow_frame2_d185f3.txt"

The Acronis True Image is yelling on the 228 file!
The Boinc Directory is excluded since 8 years. But I had to build a new machine in the last couple weeks and had installed Acronis without exclusinf the Boinc Folder. :-) Thanks for the Hint. I will work on this.

Bien trouvé, merci d'être revenu nous le dire ! Ça explique exactement le problème : le fichier se téléchargeait bien, mais Acronis le verrouillait avant que BOINC puisse le vérifier. Une fois le dossier BOINC exclu, une réinitialisation du projet (Reset project) effacera les téléchargements ratés et tout repartira. Votre machine recevra en même temps la nouvelle version 2.31.

I am also getting checksum errors when trying to get new work. I just now tried resetting the project, with no luck. I run no anti-virus on any of my machines.

https://boinc.eternityathome.org/eternity/show_host_detail.php?hostid=65

36793	Eternity II	9/30/2026 5:59:59 PM	Resetting project	
36798	Eternity II	9/30/2026 6:00:02 PM	[sched_op] Starting scheduler request	
36799	Eternity II	9/30/2026 6:00:02 PM	[sched_op] Fetching master file	
36801	Eternity II	9/30/2026 6:00:03 PM	[sched_op] Got master file; parsing	
36802	Eternity II	9/30/2026 6:00:03 PM	[sched_op] Found 1 scheduler URLs in master file	
36803	Eternity II	9/30/2026 6:00:03 PM	Master file download succeeded	
36818	Eternity II	9/30/2026 6:00:14 PM	[sched_op] Starting scheduler request	
36819	Eternity II	9/30/2026 6:00:14 PM	Sending scheduler request: To fetch work.	
36820	Eternity II	9/30/2026 6:00:14 PM	Requesting new tasks for CPU	
36821	Eternity II	9/30/2026 6:00:14 PM	[sched_op] CPU work request: 268211.18 seconds; 16.00 devices	
36826	Eternity II	9/30/2026 6:00:20 PM	Scheduler request completed: got 0 new tasks	
36827	Eternity II	9/30/2026 6:00:20 PM	[sched_op] Server version 803	
36828	Eternity II	9/30/2026 6:00:20 PM	No tasks sent	
36829	Eternity II	9/30/2026 6:00:20 PM	Project requested delay of 7 seconds	
36830	Eternity II	9/30/2026 6:00:20 PM	[sched_op] Deferring communication for 00:00:07	
36831	Eternity II	9/30/2026 6:00:20 PM	[sched_op] Reason: requested by project	
36832	Eternity II	9/30/2026 6:00:22 PM	Started download of wrapper_windows_live_227.exe	
36833	Eternity II	9/30/2026 6:00:22 PM	Started download of bw_runner_233.exe	
36834	Eternity II	9/30/2026 6:00:22 PM	Started download of solver_windows_x64.exe	
36835	Eternity II	9/30/2026 6:00:22 PM	Started download of 256pieces.txt	
36836	Eternity II	9/30/2026 6:00:22 PM	Started download of hints_frame2_86d988.txt	
36837	Eternity II	9/30/2026 6:00:22 PM	Started download of catalog_frame2_ce0f69.txt	
36838	Eternity II	9/30/2026 6:00:22 PM	Started download of root_allow_frame2_d185f3.txt	
36839	Eternity II	9/30/2026 6:00:22 PM	Started download of campaign_frame2_r65.json	
36840	Eternity II	9/30/2026 6:00:22 PM	Started download of bw_runner_228.exe	
36841	Eternity II	9/30/2026 6:00:22 PM	Started download of wrapper_26019_windows_x86_x64.exe	
36842	Eternity II	9/30/2026 6:00:23 PM	Finished download of wrapper_windows_live_227.exe (839168 bytes)	
36843	Eternity II	9/30/2026 6:00:23 PM	Finished download of 256pieces.txt (2896 bytes)	
36844	Eternity II	9/30/2026 6:00:23 PM	Finished download of root_allow_frame2_d185f3.txt (1109 bytes)	
36845	Eternity II	9/30/2026 6:00:24 PM	Finished download of bw_runner_233.exe (3144379 bytes)	
36846	Eternity II	9/30/2026 6:00:24 PM	Finished download of solver_windows_x64.exe (2418446 bytes)	
36847	Eternity II	9/30/2026 6:00:24 PM	Finished download of hints_frame2_86d988.txt (215 bytes)	
36848	Eternity II	9/30/2026 6:00:24 PM	Finished download of catalog_frame2_ce0f69.txt (145432 bytes)	
36849	Eternity II	9/30/2026 6:00:24 PM	Finished download of campaign_frame2_r65.json (357 bytes)	
36850	Eternity II	9/30/2026 6:00:24 PM	Finished download of bw_runner_228.exe (335872 bytes)	
36851	Eternity II	9/30/2026 6:00:24 PM	Finished download of wrapper_26019_windows_x86_x64.exe (768000 bytes)	
36852	Eternity II	9/30/2026 6:00:24 PM	md5_file failed for projects/boinc.eternityathome.org_eternity/bw_runner_233.exe: fopen() failed	
36853	Eternity II	9/30/2026 6:00:24 PM	[error] Checksum or signature error for bw_runner_233.exe

Ah! Windows defender sees it as:

Trojan:Win32/Bearfoos.A!ml

Whatever that is.

I told windows defender to restore it, and reset the project. It's working now. But if windows defender is seeing the app as a trojan horse, then I will not be the only one who will run into this problem. Is there some way the project can tell Microsoft to whitelist this app? Or is there a real trojan horse in it?

Thanks for tracking this down. There's no trojan: "Bearfoos.A!ml" is a machine-learning guess that Defender often makes about small, new, unsigned programs. Our launchers are built from source we control and contain nothing else.