Hello,

i've got the same error.

After a little bit debugging with Reflector.Pro (btw a great too for such purposes)

i found out that the following line in UpgradeToolBase.Version CreateVersion

"if (double.Parse(keyName.Substring(7)) >= 10.1)"

is the root cause of the problem. This resolves on a german pc to 73.0 for Version 7.3

because the dot in the german locale settings is used as an thousand-seperator and

not as a decimal seperator as in english locals.

Workaround:

Set the decimal seperator in your region and language settings to "." (the dot) while

upgrading projects.