You need to contact Rich Hamilton at support about this.
support <AT> johntillersoftware <DOT> com
OR
go to the website and use the contact sheet there.
Note: RBR will not install/work on Windows XP and the next games out will be like that as well. Unfortunately the newer installers are built that way. I loved XP but MS no longer supports it. They support that whale of an OS called Windows 10 that is a sad excuse for an OS with more bugs than Vista of ME ever had.
_________________

Generalfeldmarschall Wilhelm Prinz Peters von Dennewitz
3. Husaren-Regiment, Reserve-Kavallerie, Preußischen Armee-Korps
Honarary CO of Garde-Ulanen Regiment, Garde-Grenadier Kavallerie
NWC Founding Member
For Club Games: I prefer the Single Phase mode of play. I prefer to play with the following options
OFF:
MDF, VP4LC, NRO, MTD, CMR, PR, MIM, NDM, OMR (ver 4.07)