ISDone.dll: download the file and fix the error

32-bit (x86) Setup program Scanned by antivirus

ISDone.dll is a file used by some setup programs (often for games) to unpack large archives. Its official description: “библиотека для распаковки arc, 7z, rar, pcf, srep архивов в InnoSetup”, by FragSoft.

If it is missing or damaged, Windows displays for example: “The program can't start because ISDone.dll is missing from your computer.” Two methods can fix the error, below.

Method 1 · quick · about 1 minute

Download only ISDone.dll

Ideal if only this file is reported missing: you replace a single file, without reinstalling anything.

⇓ Download ISDone.dll .zip file: the DLL + its instructions · downloaded 183,803 times

Version: 0.6.0.0
Architecture: 32-bit (x86)
Size: 456.7 KB
Publisher: FragSoft

Then:

Extract ISDone.dll from the zip file and copy it to the folder of the program showing the error (where its .exe file is).
Still getting the error? Copy it to C:\Windows\SysWOW64 (64-bit Windows) or C:\Windows\System32 (32-bit Windows), then restart.

Errors such as “ISDone.dll: An error occurred when unpacking! Unarc.dll returned an error code” usually come from the installation conditions (disk space, memory, damaged archive): if replacing the file is not enough, follow method 2.

SHA-256: b9bdc4a0309aa47613a7b5a680c55839aa7ba28e28f96e6b9316d4d5fe1dbe9d · Check on VirusTotal · Product: ISDone library

Method 2 · complete · 10 to 30 minutes

Run the installation again in good conditions

The installation fails when the archive cannot be fully unpacked. Fix these points, then run the setup program again.

Free up disk space (at least twice the size of the game) and install into a folder with a short path, without accents or special characters (e.g. C:\Games).
Close other programs, check that Windows virtual memory is enabled, and see whether your antivirus has quarantined a file.
If the error comes back at the same point, the setup file is probably damaged: download it again.

Complete guide: unarc.dll / ISDone.dll error

Error messages related to ISDone.dll

The program can't start because ISDone.dll is missing.
Error loading ISDone.dll. The specified module could not be found.
Failed to load ISDone.dll

Why does this error occur?

Not enough disk space or memory during unpacking.
Damaged setup archive (incomplete download).
Antivirus blocking or deleting a file during installation.

Files of the same family

unarc.dll

Frequently asked questions

What do error codes -1, -7, -11 or -12 mean?

They mean that the unpacking failed: most often a lack of disk space or memory, or a damaged setup file. The steps of method 2 cover these causes.