The Maestro 4 user interface installation does not automatically install ASCOM drivers. There are separate links in the next section to install ASCOM drivers. Note: install ASCOM drivers after installing Maestro 4.
| Version | Release Date | Release Notes | Installation File | Min firmware versions |
| 0.09.017 | 14-Apr-2026 | ReadmeMaestro0_09_017 | Maestro4_Setup0_09_017.exe | PrimeTCS-Ui: 4.00.102 S-Box/SkyWalker or PrimeTCS-i: 3.00.129 DomePro2 or DomeProU: 26 FocusProU: 3 RotatorProU: 5 |
| 0.09.016 | 2-Mar-2026 | ReadmeMaestro0_09_016 | Maestro4_Setup0_09_016.exe | PrimeTCS-Ui: 4.00.102 S-Box/SkyWalker or PrimeTCS-i: 3.00.129 DomePro2 or DomeProU: 26 FocusProU: 3 RotatorProU: 5 |
| 0.09.015 | 29-Jan-2026 | ReadmeMaestro0_09_015 | Maestro4_Setup0_09_015.exe | PrimeTCS-Ui: 4.00.102 S-Box/SkyWalker or PrimeTCS-i: 3.00.129 DomePro2 or DomeProU: 26 FocusProU: 3 RotatorProU: 5 |
| 0.09.014 | 5-Jan-2026 | ReadmeMaestro0_09_014 | Maestro4_Setup0_09_014.exe | PrimeTCS-Ui: 4.00.102 S-Box/SkyWalker or PrimeTCS-i: 3.00.129 DomePro2 or DomeProU: 26 FocusProU: 3 RotatorProU: 5 |
| 0.09.008 | 17-Feb-2024 | ReadmeMaestro0_09_008 | Maestro4_Setup0_09_008.exe | PrimeTCS-Ui: 4.00.004 S-Box/SkyWalker or PrimeTCS-i: 3.00.129 DomePro2 or DomeProU: 26 FocusProU: 3 RotatorProU: 5 |
| Device | Version | Release Date | For Maestro version | Release Notes | Installation File |
| Telescope | 2.1 1.0.2 |
5-Jan-2026 17-Feb-2024 |
0.09.014 and later 0.09.008 and earlier |
ReadMeMaestroTelescopeASCOM_2_1 ReadMeMaestroTelescopeASCOM_1_0_2 |
MaestroASCOM_TelescopeSetup2_1.exe MaestroASCOM_TelescopeSetup1_0_2.exe |
| Dome | 2.1 1.0.1 |
5-Jan-2026 17-Oct-2020 |
0.09.014 and later 0.09.008 and earlier |
ReadMeMaestroDomeASCOM_2_1 ReadMeMaestroDomeASCOM_1_0_1 |
MaestroASCOM_DomeSetup2_1.exe MaestroASCOM_DomeSetup1_0_1.exe |
| Focuser | 2.1 1.0.0 |
5-Jan-2026 17-Oct-2020 |
0.09.014 and later 0.09.008 and earlier |
ReadMeMaestroFocuserASCOM_2_1 ReadMeMaestroFocuserASCOM_1_0_0 |
MaestroASCOM_FocuserSetup2_1.exe MaestroASCOM_FocuserSetup1_0_0.exe |
| Rotator | 2.1 1.0.0 |
5-Jan-2026 17-Oct-2020 |
0.09.014 and later 0.09.008 and earlier |
ReadMeMaestroRotatorASCOM_2_1 ReadMeMaestroRotatorASCOM_1_0_0 |
MaestroASCOM_RotatorSetup2_1.exe MaestroASCOM_RotatorSetup1_0_0.exe |
ASCOM support for Maestro version 4
The following documents support for the ASCOM Telescope v.3 standard in Maestro version 4:
Maestro4_ASCOM_Telescope.pdf
Maestro version 4 provides full support for the ASCOM Dome v.2 standard.
Maestro version 4 provides full support for the ASCOM Focuser v.3 standard.
Maestro version 4 provides full support for the ASCOM Rotator v.3 standard.
Note: Major ATCS software and firmware versions starting with 3.00.000 require a purchased software license to upgrade from an older version. Prior to installing telescope control system major software or firmware upgrades be sure you have the 8-character software license code associated with your hardware's serial number. Contact Astrometric support or visit our on-line store if you need a license.
Maestro version 3 user interface downloads
| Version | Release Date | Release Notes | Installation File | ATCS firmware version included |
| 3.00.111 | 15-Oct-2018 | Supports new ATCS features as described in ATCS firmware release notes below | MaestroSetup3_00_111_f_3_00_116.exe | 3.00.116 |
| 3.00.000 | 18-Feb-2015 | Supports new ATCS features as described in ATCS firmware release notes below | MaestroSetup3_00_000.exe | 3.00.000 |
ASCOM and Bisque X2 drivers for Maestro version 3
If ASCOM or Software Bisque's TheSky software is detected then the ASCOM and Bisque X2 drivers are installed with the Maestro version 3 installation. No separate installation is required. If ASCOM or TheSky is installed after Maestro 3 then simply reinstall Maestro 3 to get the necessary interface support.
The present firmware version in the hardware can be determined from Maestro's System Information dialog. This is accessible from the View --> Common --> System Information menu item.
Upgrading firmware does not result in any settings loss.
Please read the upgrade instructions included in the associated release notes.
| Version | Release Date | Release Notes | Upgrade Program | Minimum supporting Maestro 4 version |
| 4.00.103 | 5-Jan-2026 | ReadmeATCS_4_00_103 |
ATCS_4_00_103.exe |
0.09.014 |
| 4.00.004 | 6-Mar-2024 | ReadmeATCS_4_00_004 |
ATCS_Firmware4_00_004.exe |
0.09.008 |
| Version | Release Date | Release Notes | Upgrade Program | Minimum supporting Maestro 4 version |
| 44 | 2-Mar-2026 | ReadmeDomePro44 |
DomePro44.exe |
0.09.008 |
| 43 | 12-Nov-2025 | ReadmeDomePro43 |
DomePro43.exe |
0.09.008 |
| 42 | 27-Oct-2025 | ReadmeDomePro42 |
DomePro42.exe |
0.09.008 |
| 40 | 12-May-2025 | ReadmeDomePro40 |
DomePro40.exe |
0.09.008 |
| 33 | 30-May-2023 | ReadmeDomePro33 |
DomePro33.exe |
0.09.002 |
| 32 | 18-Mar-2023 | ReadmeDomePro32 |
DomePro32.exe |
0.09.002 |
| 31 | 6-Mar-2023 | ReadmeDomePro31 |
DomePro31.exe |
0.09.002 |
| 30 | 16-Jan-2023 | ReadmeDomePro30 |
DomePro30.exe |
0.09.002 |
| 29 | 7-Apr-2022 | ReadmeDomePro29 |
DomePro29.exe |
0.06.001 |
| 28 | 28-Mar-2022 | ReadmeDomePro28 |
DomePro28.exe |
0.06.001 |
| Version | Release Date | Release Notes | Upgrade Program | Minimum supporting Maestro 4 version |
| 13 | 24-May-2025 | ReadmePMC_13 |
PMC_13.exe |
0.09.008 |
| 12 | 28-Mar-2022 | ReadmePMC_12 |
PMC_12.exe |
0.06.000 |
Note: Maestro 3 user interface software installation (see above) automatically installs the indicated version of the ATCS firmware. If you need a later version of ATCS firmware you can download it from here and unzip it into the C:\Program Files (x86)\Astrometric\Maestro\ATCS_Firmware folder (default for the firmware upgrade files below). Maestro will then automatically ask you if you want to upgrade to this later version on next start-up.
Upgrading firmware does not result in any settings loss.
| Version | Release Date | Release Notes | Upgrade File |
| 3.00.129 | 1-Oct-2022 | ReadmeATCS_3_00_129 | Firmware only files are available here. |
| Contact Astrometric Instruments for older versions |
SW_Firmup
SW_Firmup.exe is a utility program that is run in a Windows command prompt (or "console") window and upgrades the firmware on PrimeTCS-i or S-Box controllers. SW_Firmup.exe is useful when Maestro3 will not upgrade the firmware (due to failed firmware upgrade) or when it is necessary to revert to an older version of firmware (Maestro3 will only upgrade to newer versions of firmware).
Please contact us for instructions on using SW_Firmup.exe.
Download a self-extracting executable to install SW_Firmup.exe from here.
Firmware upgrades for the PrimeTCS-i telescope controller's DSP chip
Note: The following upgrades are not recommended unless direct to do so by Astrometric staff. This simply serves as a convenient repository for files if a DSP firmware upgrade is needed.
Rarely upgrades are available for the firmware running on the Digital Signal Processor (DSP) chip used in PrimeTCS-i. PrimeTCS-i has two "drive units": one for RA/Az and one for Dec/Alt. When upgrading the DSP firmware be sure to run the upgrade on each drive unit in turn by connecting it via USB to a Windows-based PC and running the upgrade program linked below. Upgrade instructions can be found here.
| Version | Release Date | Release Notes | Upgrade File | Minimum ATCS firmware version |
| 8 | 10-Mar-2020 | Do not install unless directed to do so by Astrometric. ReadmePTCS_8. | For absolute encoders | 3.00.118 |
| Contact Astrometric Instruments for older versions |
Note: To use a DSP firmware upgrade you must assure that the ATCS firmware is already upgraded to a minimum version which is noted in the table above. Instructions on how to do this are included in the associated release notes file.