I recently ran into similar problems and found that it was a two-fold issue.
1) Make sure that you are using the EXE or MSI that does NOT have "-St" on the end of the filename (I.e. - DamewareRS-St.exe). The "-St" files are (apparently) the standalone only installers and rdo not accept the Centralized Server command line switches. I had to contact tech support to get the EXE files w/o "-St"
2) If you happen to be using the EXE to install, and are trying the command line arguments supplied in the article here: Installing Mini Remote Control or Remote Support from the Command Line , I found that it contains a superflous " in the command line line after the 'SILENT=yes' parameter. This needs to be removed. Otherwise, you are actually 'cutting off' all the Central Server parameters and they are not processed.
Hopefully this help.