Just done.
I renamed the file. It reappeared in three seconds. I deleted it. The recycle bin showed an error: "Item is already in use." By what? Task Manager showed nothing. No processes. No handles.
Then the cursor moved. Half a pixel. Just once. isdone.dll crc check error
I don’t run installers anymore. But sometimes, at 03:17 in the morning, my screen flickers for one frame.
No file path. No DLL name. No CRC.
I restarted the installer. Same error at 47.3%. Restarted the PC. Same. Tried a different drive. Same offset. Same precise, maddening consistency.
Not drift. Not hardware.
Like something was testing whether I’d notice.