Bug in ttmathuint_x86_64_msvc.asm
You are using ESP as the offset for the stack frame but should be using rsp.
This will fail when the process is located in memory that you can't represent with the 32 bit esp.
Thanks, what a stupid error.
Is there any chance you will do a new release? It has been a while and there have been a couple of fixes.
Please make sure that everythig works fine. In the package there is a 'doc' directory with auto generated documentation from doxygen. If there is no any problem then within two weeks a new release will be made.