Here are the release notes for 2.6.13dev1:
v2.6.13dev1
27 December 2023
- Windows: remove cameras with obsolete SDKs: Fishcamp, Meade-DSI,
SAC4-2, SSAG. To use these cameras, stick with an older version of PHD2.
- Mac: no longer building for 32-bit Macs. To use 32-bit Macs, stick with an older version of PHD2.
- INDI: update to INDI 2.0
- Touptek cameras: update SDK lib to version 55.24239.20231224
These cameras are nearly 20 years old, the original Meade company is long, long gone, their original software development kit can't be used in current-day development environments, and they never produced an ASCOM driver for the camera. If you can't justify getting a better guide camera, you can stay on the 2.6.13 baseline release of PHD2 but you won't be able to upgrade beyond that.
Regards,
Bruce