A few customers have reported that Kareo will fail to install on a clean computer where Kareo has never been installed in the past. We have confirmed the problem, and believe that it may be related to the installation of the .NET framework. Until we finish our research and determine the permanent fix we recommend that customers affected by this problem install the .NET framework separately before installing Kareo. To do so, visit this Microsoft page and download and install the "dotnetfx.exe" program. Once finished, try installing Kareo again.
If you already have Kareo installed, you are not affected by the problem. Only perform the step described above if when installing Kareo you receive a message "Runtime Error" and "abnormal program termination". We will post another update when we have determined the cause and permanently fix the problem.
by KareoSupport to Client Software