A bug in the Microsoft Redistributable libraries v.14.50 may cause a crash in Forest Pack and other 3DS Max plugins.
The problem is being investigated by Microsoft, and we hope an update is available shortly.
Unfortunately we cannot fix the problem from our side, because it seems the code which triggers the bug may be also present in the 3DS Max code itself.
Until then, you can fix it copying the attached DLL (vcomp140.dll) in the 3DS Max root folder.
If you are curious, the problem is described in detail in the
Microsoft forums (very technical).