vcredist problems

[HimbeersaftLP]

1. Sometimes it doesn't get downloaded properly for whatever reason and just results in a 0 Bytes file instead.
2. Sometimes it gets corrupted.

Solution for 1 would be to integrate it into the installer exe as a resource.

2 seems to have been solved by Microsoft because I haven't heard any recent issues, I just added it for the record.

Both can be reduced in frequency by checking if a late-enough version is already installed before attempting to run the vcredist installer.