de la Mancha plugins are made using SynthEdit, so for this reason they can only be used on Windows based VST hosting systems. There are no plans to make Mac versions.
If you do spot a bug, please feel free to let me know about it.

There are 2 versions of SynthEdit used to develop de la Mancha plug-ins, SE 1.0 for older plugins and SE 1.1 for newer or updated plugins

Where you see the SE 1.1 logo on the plugins page

this means that the plugin was developed or updated using the latest version of SynthEdit (SE 1.1)
Plug-ins developed with this version of SynthEdit have no problems at all with multiple instances on multi-core processors. This problem is only related to plugins developed with SE 1.0

For those plugins developed using SynthEdit 1.0 (1.017, 1.1016 or 1.015), there is a known bug that affects some multicore processors, although it isn't precisely documented. Some users with multicore processors and certain hosts have reported issues when trying to load multiple instances of the same SynthEdit plugin. This bug is not reproducable on all systems or hosts, and may not occur on your system. If you have a multicore processor you are strongly urged to fully test the demo version of any plugin on your system before purchasing.
This bug does NOT affect single core processors or single instances of a plugin
This bug only seems to apply in hosts with multi-core support
Whilst SE 1.1 does fix this bug, there is no guarantee that all de la Mancha plugins will be updated to SE 1.1, as the compatibility of projects between the two versions is not certain.
If you do have issues with multiple instances, there is a potential workaround. By making several copies of plugin.dll (eg plugin_1.dll, plugin_2.dll, etc) in your VST directory, your host will see each one as a different plugin and be able load one instance of each

Most plugins have a EULA included in the manual or readme file. Some early freeware plugins did not, but please refer to the default EULA here where none is included in the download.

All dlM plugins are installed by copying the contents of the downloaded zip or rar file into your VST directory. No installers are used, so you decide exactly where the files go. You must ensure the full contents of the zip or rar are extracted, maintaining any folder structure, as often additional folders and files are included which the plugin must access to function. Uninstalling is done by simply deleting the files and folder that was installed. No files are written to the registry. If you have any problems with installation, please let me know about it and I will try to assist

If you get "Can't find module" errors when you load a plugin in your host, it is a sign of a problem with the Windows folder permissions for your VST directory. All SynthEdit plugins need to auto-extract some module files to your hard drive, but unless the Windows folder permissions for your VST directory are set to allow write access, then this may not happen. Usually XP allows write by default, but Vista and Windows 7 don't. You should be able to solve this by changing the permissions to allow write access, or having Administrator access levels.

You can check that the modules have been extracted by looking in the VST directory where you saved the .dll file. Wherever you saved the pluginname.dll there is a folder called pluginname too and in that folder there should be a bunch of .sep / .sem files

If the files are not there, you should change the folder permissions and then reload the plugin in your host

Some of the plugin synths have sample based oscillators (dirty harry, Scylla, plastique, miniSID, psymon, styrofoam) which means they have an additional file(s) in the zip file that contain the samples. You need to make sure you extract the contents of the zip so that the folder structure is maintained and the plugin can locate the samples. If you only extract the .dll or do not preserve the folder structure, then the synth will be silent

Many free Anti virus programs are reporting trojans and malware in error with CK modules within my plugins. Kapersky, Avira AntiVir and Avast! are showing false positives with CK modules ( CK_Warp.sep, CK_Host_BPM.sep, CK_polyphony_control.sep, etc) which are used in SynthEdit plugins such as mine. False Positive means they report a trojan or virus when there isn't one.

I have reported each case to these software houses and each time it is confirmed as a false positive, with the message that they will update the next version of their anti-virus software.

If you encounter an alert from your AV software, you should report the false positive to the AV company and they will confirm it for you

http://support.kaspersky.com/virlab/helpdesk.html - choose false alarm from list
http://analysis.avira.com/samples/ - choose suspected false positive
virus@avast.com - send file in a password protected zip

There are no trojans, viruses or malware in my plugins. You can use de la Mancha plugins in peace :)

I am no longer able to support license transfers

You may use any of my plugins in commercial music releases without condition. There is no financial or non-financial requirement, but feel free to credit de la Mancha or link to this site if you enjoyed using my plugins

The same applies to any included sample content (loops, samples, waveforms etc) that comes with the plugins. You may use these however you wish in your music, even within other plugins, samplers and software.

However, you may not redistribute (free or otherwise) the sample content in it's original form, or as modified samples. Their use is restricted to part of an original musical piece.