The genuine isdonedll is safe. However, malware sometimes disguises itself with the same name. Always verify the digital signature: Right-click the DLL → Properties → Digital Signatures tab → Ensure "Tonec Inc." is listed.
: Low storage space or bad sectors on your drive can prevent successful installation. Top Fixes for Windows 10 64-Bit isdone.dll and unarc.dll help me please. - Microsoft Q&A download isdonedll 64 bit windows 10 upd