If increasing the virtual memory did not work, you may genuinely be missing the file. Be very careful when downloading DLL files; only use reputable sources to avoid malware.
Some legacy installers require the 32-bit isdone.dll in the same folder as Setup.exe.
Do not copy to C:\Windows\System32 — that can break system behavior.
Instead, place it next to the installer, but only if you trust the source (e.g., extracted from an official Inno Setup installation). isdone.dll download windows 7 64 bit
This is the most effective fix for Windows 7 users. Since 32-bit installers are capped at 2GB of RAM usage, they rely heavily on virtual memory (page file) to unpack large archives. If your virtual memory is low or disabled, the installation will fail.
Use 7-Zip to extract the installer contents: If increasing the virtual memory did not work,
If you are still stuck, follow this checklist:
Note on Security: Always scan any downloaded .dll file with an antivirus program before copying it to your Windows system folder. Click Set , then OK
The original file may be incomplete. Download a fresh copy from the official source.